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Jupiter is the largest planet in the solar system, with a diameter of about 86,900 miles (139,800 km).
Jupiter is more massive than all the other planets in the solar system combined.
More than 1,300 Earths could fit inside the volume of Jupiter.
Jupiter is named after the king of the Roman gods, fitting for the largest planet in the sky.
In Greek mythology, Jupiter's counterpart is Zeus, ruler of the Olympian gods.
Jupiter spins faster than any other planet, completing a full rotation in under 10 hours.
Because it spins so fast, Jupiter bulges noticeably at its equator and is visibly flattened at its poles.
A year on Jupiter lasts about 12 Earth years, the time it takes to complete one orbit around the Sun.
Jupiter orbits the Sun at an average distance of about 484 million miles (778 million km).
Jupiter is often called a "gas giant" because it has no true solid surface to stand on.
Jupiter is made up almost entirely of hydrogen and helium, similar in composition to a small, dim star.
Deep inside Jupiter, immense pressure squeezes hydrogen into a strange liquid metallic state that conducts electricity.
Scientists believe the flow of liquid metallic hydrogen deep within Jupiter generates its extraordinarily powerful magnetic field.
Jupiter's magnetic field is the strongest of any planet in the solar system, roughly 20,000 times stronger than Earth's.
Jupiter's magnetosphere is so vast that, if it could be seen from Earth, it would appear larger than the full Moon in the sky.
Some scientists think Jupiter may have a dense core of rock and ice, though its exact size and structure are still debated.
Jupiter radiates more heat into space than it receives from the Sun, a leftover of the energy released during its formation.
Jupiter's Great Red Spot is a giant storm that has been raging for at least 150 years, and possibly far longer.
The Great Red Spot is large enough that Earth could comfortably fit inside it, though it has been slowly shrinking in recent decades.
Winds inside the Great Red Spot can reach speeds of over 250 miles per hour.
Nobody is entirely sure what gives the Great Red Spot its reddish color, though chemical reactions triggered by sunlight are a leading theory.
Jupiter's colorful bands of clouds are created by fast-moving jet streams flowing in opposite directions at different latitudes.
The lighter bands on Jupiter are called zones, and the darker bands are called belts, distinguished by differences in cloud height and composition.
Jupiter's clouds are made mostly of ammonia crystals, giving the planet its characteristic swirling white, orange, and brown patterns.
Jupiter has powerful storms and lightning far more intense than anything seen on Earth.
Jupiter has faint rings, first discovered by the Voyager 1 spacecraft in 1979, made mostly of fine dust rather than ice.
Jupiter's rings are thought to be made largely of dust kicked up by meteoroid impacts on its small inner moons.
Jupiter has the most confirmed moons of any planet in the solar system, with well over 90 discovered so far.
Jupiter's four largest moons, Io, Europa, Ganymede, and Callisto, are known as the Galilean moons.
The Galilean moons were discovered by Galileo Galilei in 1610, the first moons ever found orbiting a planet other than Earth.
Galileo's observations of Jupiter's moons helped confirm that not everything in the sky orbits the Earth, supporting the Copernican model of the solar system.
Ganymede, Jupiter's largest moon, is the biggest moon in the entire solar system, even bigger than the planet Mercury.
Ganymede is the only moon in the solar system known to generate its own magnetic field.
Europa, one of Jupiter's moons, is thought to hide a saltwater ocean beneath its icy crust that may hold more water than all of Earth's oceans combined.
Europa's icy surface is remarkably smooth, crisscrossed with long cracks that suggest an active, shifting shell of ice.
Europa's hidden ocean makes it one of the most promising places in the solar system to search for life beyond Earth.
Io, Jupiter's innermost large moon, is the most volcanically active body in the entire solar system.
Io's intense volcanism is driven by tidal heating, as Jupiter's gravity and the pull of neighboring moons constantly flex and stretch its interior.
Some of Io's volcanic plumes shoot material hundreds of miles above its surface.
Callisto, the outermost Galilean moon, has one of the most heavily cratered surfaces in the solar system, suggesting it hasn't changed much in billions of years.
Callisto may also hide a subsurface ocean beneath its ancient, ice-covered crust, though evidence is less certain than for Europa.
Many of Jupiter's smaller moons orbit backward relative to the planet's rotation, suggesting they were captured rather than formed alongside it.
Jupiter's powerful gravity acts like a cosmic shield, deflecting or capturing many comets and asteroids that might otherwise threaten the inner solar system.
In 1994, fragments of Comet Shoemaker-Levy 9 spectacularly collided with Jupiter, leaving dark scars visible in telescopes for months.
Jupiter shares its orbit with thousands of Trojan asteroids, clustered at gravitationally stable points ahead of and behind the planet.
Pioneer 10 became the first spacecraft to fly past Jupiter in 1973, offering humanity's first close-up look at the giant planet.
Pioneer 11 followed in 1974, using Jupiter's gravity to help slingshot itself onward toward Saturn.
Voyager 1 and Voyager 2 both flew past Jupiter in 1979, capturing detailed images of its moons and discovering its faint ring system.
NASA's Galileo spacecraft orbited Jupiter from 1995 to 2003, the first mission ever to orbit an outer planet.
Galileo dropped a small probe into Jupiter's atmosphere in 1995, which survived for about an hour before being crushed by extreme pressure.
At the end of its mission in 2003, the Galileo spacecraft was deliberately crashed into Jupiter to avoid contaminating potentially habitable moons like Europa.
NASA's Juno spacecraft has been orbiting Jupiter since 2016, studying its interior, atmosphere, and magnetic field in unprecedented detail.
Juno takes a highly elliptical orbit around Jupiter partly to minimize its exposure to the planet's intense radiation belts.
Juno's images revealed that Jupiter's poles are dotted with clusters of enormous, swirling cyclones arranged in striking geometric patterns.
NASA's Europa Clipper mission, launched in 2024, is designed to study Europa's icy shell and hidden ocean in detail during dozens of close flybys.
The European Space Agency's JUICE mission, launched in 2023, is headed to study Jupiter and its icy moons Ganymede, Callisto, and Europa.
JUICE is planned to eventually enter orbit around Ganymede, the first spacecraft ever to orbit a moon other than our own.
Jupiter's intense radiation belts are powerful enough to damage unshielded spacecraft electronics within hours.
Jupiter is bright enough to be one of the easiest planets to spot with the naked eye, often outshone in the night sky only by Venus.
With a small pair of binoculars, it's possible to spot Jupiter's four Galilean moons lined up beside the planet, just as Galileo once did.
Jupiter's average cloud-top temperature is a frigid -166°F (-110°C).
Despite the freezing cloud tops, temperatures rise dramatically the deeper you go into Jupiter's atmosphere and interior.
Jupiter's core is thought to reach temperatures of tens of thousands of degrees, hotter than the surface of the Sun.
A day on Jupiter isn't quite the same everywhere, since it's a gas giant that rotates slightly faster at the equator than near the poles.
Jupiter is so massive that its gravity strongly influences the orbits of many smaller bodies throughout the solar system.
If Jupiter had been roughly 80 times more massive, it could have become a star instead of a planet.
Jupiter is often called a "failed star" because its composition is similar to a star's, even though it never grew massive enough to ignite nuclear fusion.
Jupiter's gravity is more than twice that of any other planet in the solar system, about 2.5 times Earth's.
A 150-pound person on Earth would weigh nearly 380 pounds if they could somehow stand on Jupiter's cloud tops.
Jupiter's mass is roughly 318 times that of Earth.
Ancient Babylonian astronomers tracked Jupiter's movements across the sky more than 2,000 years ago.
In Hindu astronomy, Jupiter is known as Brihaspati or Guru, associated with wisdom and knowledge.
In Chinese tradition, Jupiter is called the "Wood Star" and was historically used to track a roughly 12-year cycle in the calendar.
Jupiter's storms can last for centuries, unlike storms on Earth that dissipate within days or weeks.
A smaller storm on Jupiter, nicknamed "Red Spot Jr.," formed in the early 2000s from the merger of several smaller storms.
Jupiter's cloud layer is relatively thin, only about 30 to 45 miles deep, sitting atop a much deeper atmosphere of hydrogen and helium gas.
Scientists believe Jupiter may have giant helium rain falling deep within its atmosphere, where droplets of helium separate out from the surrounding hydrogen.
Jupiter likely formed within the first few million years of the solar system's history, making it one of the oldest planets.
Some models suggest Jupiter may have migrated significantly closer to the Sun before settling into its current orbit, reshaping the young solar system in the process.
Jupiter's gravity is thought to have played a major role in shaping the asteroid belt between Mars and Jupiter, clearing out and scattering material over billions of years.
Jupiter's auroras, driven by its powerful magnetic field, are far more intense and permanent than the fleeting auroras seen on Earth.
Jupiter's auroras have been observed producing X-rays, a phenomenon not seen at any other planet in the solar system.
Io's volcanic activity constantly feeds material into Jupiter's magnetosphere, creating a donut-shaped ring of charged particles called the Io plasma torus.
Jupiter's moon system is sometimes described as a miniature solar system of its own, given how many moons orbit it.
New moons of Jupiter are still being discovered using powerful ground-based telescopes, decades after the first four were found.
Jupiter's outermost known moons are so far away and orbit so slowly that some take more than two Earth years to complete a single lap.
Jupiter has no fixed solid surface, so a spacecraft attempting to land would instead sink deeper and deeper into increasingly dense gas and liquid.
Jupiter's atmosphere lacks the layered cloud structure of Earth's weather systems, instead forming continuous, planet-circling bands of wind.
Jupiter's jet streams can blow at speeds exceeding 300 miles per hour, among the fastest sustained winds found on any planet.
Ganymede has its own thin oxygen atmosphere, though far too tenuous to support human breathing.
Ganymede is believed to have its own subsurface saltwater ocean sandwiched between layers of ice, adding it to the list of possible ocean worlds around Jupiter.
Callisto orbits far enough from Jupiter that it receives much less radiation than its inner Galilean siblings, making it an appealing potential site for future crewed exploration.
Io's surface is covered in colorful sulfur compounds, giving it a mottled yellow, orange, and red appearance often compared to a pizza.
Io has almost no impact craters, because its constant volcanic activity resurfaces the moon faster than craters can accumulate.
Jupiter's Great Red Spot rotates counterclockwise, completing one full spin roughly every six Earth days.
Astronomers have tracked the Great Red Spot since at least the 1830s, though some historical records may point to observations even earlier.
Jupiter's rings are far too faint to see with amateur telescopes and were unknown until spacecraft flew close enough to detect them.
Unlike Saturn's icy rings, Jupiter's ring system is thought to constantly lose material to space and be replenished by ongoing dust production.
Jupiter's gravitational influence is strong enough that it slightly tugs the Sun itself, causing the Sun to wobble around a point just outside its own surface.
Because of its brightness and steady position, ancient astronomers across many cultures independently tracked Jupiter as one of the five visible "wandering stars."
Jupiter's atmosphere contains small amounts of methane, water vapor, and ammonia in addition to its overwhelmingly hydrogen and helium composition.
Jupiter's fast rotation and internal heat combine to drive some of the most violent, long-lasting storm systems found anywhere in the solar system.
The Juno mission's name refers to the Roman goddess Juno, wife of Jupiter, who in mythology could see through the clouds the god used to hide himself.
Jupiter's four Galilean moons are large enough that all four could be seen as small disks, not just points of light, through a decent backyard telescope.
Because Jupiter is so massive, it barely moves in response to the Sun's gravity compared to smaller planets, making its orbit unusually stable over long timescales.
Jupiter's moons Io, Europa, and Ganymede are locked in a precise 4:2:1 orbital resonance, meaning their orbital periods form simple whole-number ratios.
This orbital resonance among Io, Europa, and Ganymede constantly stretches and squeezes their interiors, a major source of the internal heat driving Io's volcanoes.
Jupiter has been visited or studied by spacecraft from NASA, the European Space Agency, and, through flyby imaging, several international missions headed elsewhere in the solar system.
Jupiter's status as the solar system's largest planet has made it a common target for gravity-assist maneuvers, where spacecraft use its gravity to gain speed en route to more distant destinations.
New Horizons, the spacecraft that later flew past Pluto, used a gravity assist from Jupiter in 2007 to shorten its journey by about three years.
Mars is named after the Roman god of war, likely because its reddish color reminded ancient observers of blood.
Ancient Egyptians called Mars "Her Desher," meaning "the red one," thousands of years before telescopes existed.
A day on Mars, called a "sol," lasts about 24 hours and 37 minutes, only slightly longer than a day on Earth.
A year on Mars lasts about 687 Earth days, almost twice as long as an Earth year.
Mars has a diameter of about 4,220 miles (6,779 km), roughly half the diameter of Earth.
Mars's gravity is about 38% of Earth's, so a 150-pound person would weigh only about 57 pounds there.
Even though Mars is much smaller than Earth, its total land surface area is roughly comparable to Earth's, since Mars has no oceans.
Mars orbits the Sun at an average distance of about 142 million miles (228 million km).
At its closest recorded approach in 2003, Mars came within about 34.6 million miles of Earth, the nearest in nearly 60,000 years.
Mars's axial tilt of about 25 degrees is close to Earth's, which is why it has four seasons much like our planet.
Because a Martian year is so much longer than Earth's, each Martian season lasts roughly twice as long as its Earth counterpart.
Mars's orbit is noticeably more elliptical than Earth's, so its distance from the Sun varies more sharply over the Martian year.
Mars's atmosphere is about 95% carbon dioxide, with only trace amounts of oxygen and water vapor.
The atmospheric pressure on Mars is less than 1% of Earth's, too thin to support liquid water on the surface today.
Because Mars's atmosphere is so thin, it traps very little heat, causing huge temperature swings between day and night.
Temperatures near the Martian poles can plunge to about -195°F (-125°C) in winter.
On a warm summer day near the Martian equator, temperatures can briefly reach around 70°F (20°C).
Daytime skies on Mars often appear butterscotch or reddish, tinted by fine iron oxide dust suspended in the thin atmosphere.
Sunsets on Mars can look bluish, the opposite of Earth, because Martian dust scatters light differently than our atmosphere does.
Mars does not have a global magnetic field today, though patches of magnetized rock in its crust show it once did billions of years ago.
Scientists think the loss of Mars's magnetic field let solar wind gradually strip away most of its once-thicker atmosphere.
Olympus Mons, the largest volcano on Mars, stands about 13.6 miles (22 km) high, nearly three times the height of Mount Everest.
Olympus Mons is so wide at its base that it would cover an area roughly the size of the state of Arizona.
Olympus Mons is a shield volcano, built up gradually by countless lava flows rather than a single explosive eruption.
Three more giant volcanoes, Arsia Mons, Pavonis Mons, and Ascraeus Mons, line up in a row on Mars's Tharsis plateau.
Valles Marineris, a canyon system on Mars, stretches roughly 2,500 miles long, nearly the width of the continental United States.
In places, Valles Marineris plunges as deep as 4.3 miles (7 km), more than seven times deeper than Earth's Grand Canyon.
Hellas Planitia is a massive impact basin on Mars, one of the largest confirmed impact craters in the entire solar system.
Mars has two polar ice caps that grow and shrink with the seasons as frozen carbon dioxide comes and goes.
Beneath its seasonal frost, Mars's northern polar cap holds a thick layer of water ice.
Mars's southern polar cap keeps a permanent layer of frozen carbon dioxide, often called "dry ice," year-round.
Mars has clouds too, made of water ice or, at times, of frozen carbon dioxide crystals.
Dust devils, small spinning columns of wind and dust, regularly sweep across the Martian surface and have even been photographed from orbit.
Mars occasionally experiences planet-encircling dust storms so vast they can block sunlight across the entire globe for weeks.
A global dust storm in 2018 blotted out so much sunlight that it silenced NASA's solar-powered Opportunity rover for good.
Global Martian dust storms tend to strike during southern hemisphere summer, when Mars is closest to the Sun in its elliptical orbit.
The Martian south pole is home to strange "spider" patterns in the ground, carved as trapped carbon dioxide ice turns directly to gas each spring.
Mars has two small moons, Phobos and Deimos, both thought to be either captured asteroids or debris from an ancient impact.
Phobos and Deimos are named after the sons of Ares, the Greek god of war, whose names mean "fear" and "dread."
Phobos orbits Mars so quickly, about three times a day, that it appears to rise in the west and set in the east.
Phobos is slowly spiraling inward toward Mars and is expected to eventually break apart or crash into the planet within tens of millions of years.
Deimos, the smaller and more distant of Mars's two moons, is lumpy and irregularly shaped rather than round.
Neither Martian moon is large enough for its own gravity to pull it into a spherical shape.
Ancient river channels and fan-shaped deltas etched into the Martian surface suggest liquid water once flowed there in abundance.
Some scientists believe Mars's northern lowlands may once have held a vast ocean, billions of years before the planet dried out.
NASA's Opportunity rover found small mineral spheres nicknamed "blueberries," made of hematite that typically forms in the presence of water.
NASA's Phoenix lander confirmed water ice just beneath the Martian soil near the north pole in 2008.
Radar studies have detected large deposits of water ice hidden underground across many regions of Mars.
Dark streaks called recurring slope lineae appear and grow on some Martian crater walls during warm seasons, though scientists still debate whether they involve any liquid water.
Gullies carved into some Martian crater walls hint that liquid water, or perhaps carbon dioxide frost, may still shape the surface occasionally today.
NASA's Curiosity rover has detected organic molecules, the carbon-based building blocks of life, preserved in ancient Martian rocks.
Curiosity has also measured methane in the Martian atmosphere that mysteriously rises and falls with the seasons, and its source is still unknown.
In 2021, the Perseverance rover's MOXIE instrument successfully produced breathable oxygen from Mars's carbon dioxide atmosphere for the first time.
NASA's InSight lander detected marsquakes on Mars, revealing that the planet still has a molten, at least partly liquid, core.
Seismic data from InSight suggests Mars's core has a radius of roughly 1,140 miles, larger than scientists had previously estimated.
Mariner 4 became the first spacecraft to fly past Mars in 1965, returning the first close-up images ever taken of another planet.
Mariner 9 became the first spacecraft to orbit another planet when it reached Mars in 1971.
The Soviet Mars 3 mission achieved the first soft landing on Mars in 1971, but its lander transmitted for only about 20 seconds before falling silent.
NASA's Viking 1 became the first fully successful lander on Mars in 1976, operating on the surface for more than six years.
The Viking landers carried out experiments specifically designed to search for microbial life in Martian soil, though results were inconclusive.
So many early Mars missions failed that space enthusiasts nicknamed the run of bad luck the "Great Galactic Ghoul."
Roughly half of all Mars missions ever attempted, across every space agency, have ended in partial or total failure.
NASA lost its Mars Climate Orbiter in 1999 after one engineering team used metric units and another used imperial units for the same calculations.
The British Beagle 2 lander was presumed lost after its 2003 landing, until orbital images found it intact on the surface more than a decade later.
Sojourner, the first rover to operate on Mars in 1997, was roughly the size of a microwave oven.
NASA's Spirit and Opportunity rovers landed on Mars in 2004, each designed for a 90-day mission.
Opportunity kept exploring Mars for almost 15 years before a global dust storm finally ended communication with it in 2018.
Spirit became stuck in soft Martian soil in 2009 and eventually stopped communicating with Earth in 2010.
Curiosity, roughly the size of a small car, landed inside Mars's Gale Crater in 2012 using a rocket-powered "sky crane."
Curiosity's main science target, Mount Sharp, is a layered mountain of sediment rising from the floor of Gale Crater.
Both Curiosity and Perseverance run on nuclear power from a radioisotope generator, letting them keep working without relying on sunlight.
Earlier solar-powered rovers like Spirit and Opportunity gradually lost power as dust settled on their solar panels over time.
NASA's Perseverance rover landed in Jezero Crater in 2021, a site chosen because it holds the remains of an ancient river delta.
Perseverance is drilling and caching rock samples on Mars for a future mission designed to bring them back to Earth for study.
Perseverance carries microphones that have recorded the actual sound of Martian wind and the rover's own mechanical clicks and whirs.
Because Mars's atmosphere is thin and mostly carbon dioxide, sound there travels more quietly and higher-pitched tones fade out faster than on Earth.
In April 2021, NASA's Ingenuity helicopter made the first powered, controlled flight ever achieved on another planet.
Ingenuity had to spin its rotor blades far faster than any helicopter on Earth to generate lift in Mars's thin atmosphere.
Ingenuity flew 72 flights on Mars before rotor damage grounded it for good in early 2024, far outlasting its planned five-flight test campaign.
China's Zhurong rover touched down on Mars in 2021 as part of the Tianwen-1 mission, making China only the second country to land and operate a rover there.
The United Arab Emirates' Hope probe entered orbit around Mars in 2021, becoming the first Mars mission led by an Arab nation.
The European Space Agency's Mars Express orbiter has been studying the planet continuously since 2003.
NASA's Mars Reconnaissance Orbiter carries the HiRISE camera, sharp enough to spot surface features smaller than a yard across from orbit.
More than 300 meteorites found on Earth have been identified as originating from Mars, blasted into space by ancient asteroid or comet impacts.
A Martian meteorite found in Antarctica in 1984, known as ALH84001, once sparked controversy when some scientists suggested it held fossilized microbial life, a claim now widely disputed.
Mars has at least five known trojan asteroids, small bodies that share its orbit around the Sun.
Mars is bright enough to see with the naked eye from Earth and has been observed by skywatchers since ancient times.
Babylonian astronomers associated Mars with Nergal, their god of war and plague, thousands of years ago.
In Hindu astrology, Mars is known as Angaraka or Mangala and is tracked as one of the classical navagraha bodies.
Mars's puzzling retrograde motion in the night sky, appearing to move backward at times, helped inspire ancient debates that eventually led to the heliocentric model of the solar system.
A trip to Mars with current propulsion technology takes roughly seven months one way.
Because Mars and Earth orbit the Sun at different speeds, launch windows to Mars only open up roughly once every 26 months.
NASA and other agencies are studying future crewed missions to Mars, though no human has yet set foot on the planet.
SpaceX has designed its Starship rocket with the long-term goal of eventually carrying astronauts and cargo to Mars.
Researchers use extreme places on Earth, like Antarctica's Dry Valleys and Chile's Atacama Desert, as stand-ins for testing Mars exploration technology and searching for life in Mars-like conditions.
Because Mars lacks an ozone layer, its surface receives far more damaging ultraviolet radiation than Earth's does.
Mars's thin atmosphere and lack of a magnetic field mean the surface is also bathed in more cosmic radiation than Earth, a major challenge for future astronauts.
Mars has no moons large enough to stabilize its axial tilt the way Earth's Moon does, so its tilt is thought to have wandered more dramatically over millions of years.
Mars's iconic red-orange color comes from iron oxide, essentially rust, coating fine dust across most of its surface.
Beneath its rusty dust, much of the actual bedrock on Mars is grey or black basalt, similar to volcanic rock found on Earth.
Some regions of Mars, like the Medusae Fossae Formation, are covered in soft, easily eroded material that wind has carved into strange ridges and grooves.
Mars's craters range from tiny pits to Hellas Planitia, which measures roughly 1,300 miles across.
Mars is a favorite target for amateur astronomers because it can be viewed through a modest backyard telescope during its closest approaches to Earth.
Mars has surface gravity of about 3.72 meters per second squared, well under half of Earth's 9.8.
A Martian year lasts roughly 668 to 669 Martian sols, even though it equals about 687 Earth days.
The Perseverance rover's landing site, Jezero Crater, was once filled by a lake fed by a river that deposited a fan-shaped delta still visible today.
Mars's two moons are so small that Phobos is only about 14 miles across and Deimos just 7.7 miles across at their longest points.
Because Deimos orbits so far out and slowly, it would appear from the Martian surface as little more than a bright, star-like point of light.
The word "areology" is sometimes used for the geological study of Mars, borrowing from Ares, the Greek name for the god of war.
Mars has been visited or observed by robotic missions from the United States, the Soviet Union/Russia, Europe, India, China, Japan, and the United Arab Emirates.
Saturn is the second-largest planet in the solar system, with a diameter of about 72,400 miles (116,500 km).
Saturn is named after the Roman god of agriculture and time, known as Cronus in Greek mythology.
The day Saturday takes its name from Saturn, one of the seven classical "planets" that gave English weekdays their names.
Saturn is the least dense planet in the solar system, with an average density lower than that of water.
If there were an ocean large enough to hold it, Saturn would float, since its overall density is less than water's.
A day on Saturn lasts only about 10.7 hours, making it the second-fastest rotating planet after Jupiter.
A year on Saturn lasts about 29.5 Earth years, the time it takes to complete one orbit around the Sun.
Saturn orbits the Sun at an average distance of about 886 million miles (1.4 billion km).
Like Jupiter, Saturn is a gas giant made up almost entirely of hydrogen and helium, with no solid surface to land on.
Saturn's fast rotation causes it to bulge noticeably at the equator, giving it a visibly flattened, oval shape.
Saturn's rings are made up mostly of countless chunks of water ice, ranging in size from tiny grains to boulders.
Despite stretching across hundreds of thousands of miles, Saturn's main rings are remarkably thin, in places less than a few hundred feet thick.
Saturn's rings are labeled alphabetically in the order they were discovered, not the order they appear from the planet outward.
The Cassini Division, a wide gap between Saturn's A and B rings, was first spotted by astronomer Giovanni Cassini in 1675.
Small moons called "shepherd moons" orbit within and near Saturn's rings, their gravity helping keep the ring particles confined into sharp, narrow bands.
Saturn's thin, braided F ring puzzled scientists when Voyager first photographed its unusual twisted structure in 1980.
Dark, radial markings called "spokes" occasionally appear and fade across Saturn's rings, thought to be linked to electrically charged dust.
Because Saturn's rings are tilted relative to its orbit, they appear to open and close from Earth's view over the course of its 29.5-year orbit.
Roughly every 15 years, Saturn's rings turn edge-on to Earth and briefly become almost invisible, even through a telescope.
Scientists have proposed several theories for how Saturn's rings formed, including a shattered moon, comet, or leftover material from the planet's early formation.
Some research suggests Saturn's rings may be a relatively young feature, possibly forming within only the last few hundred million years.
Saturn has more than 140 confirmed moons, one of the largest moon systems of any planet in the solar system.
Titan, Saturn's largest moon, is bigger than the planet Mercury and is the second-largest moon in the entire solar system.
Titan is the only moon in the solar system known to have a thick, substantial atmosphere, denser than Earth's.
Titan's atmosphere is mostly nitrogen, similar in composition to Earth's, though its surface conditions are radically different.
Titan has lakes, rivers, and rain, but instead of water they're made of liquid methane and ethane.
Titan's methane cycle behaves much like Earth's water cycle, with evaporation, clouds, and rainfall shaping its surface over time.
Beneath its icy shell, Titan is thought to hide a subsurface ocean of liquid water, adding it to the solar system's list of potential ocean worlds.
In 2005, the Huygens probe landed on Titan, becoming the first spacecraft to touch down on a moon in the outer solar system.
Images from the Huygens probe revealed a Titan landscape of rounded pebbles and drainage channels shaped by flowing liquid.
Enceladus, one of Saturn's icy moons, shoots huge plumes of water vapor and ice particles from cracks near its south pole.
The geysers on Enceladus are powerful evidence of a subsurface liquid water ocean hidden beneath its frozen crust.
Material erupting from Enceladus's geysers is thought to be the main source that feeds Saturn's faint, icy E ring.
Chemical analysis of Enceladus's plumes has detected molecular hydrogen, a potential energy source that could support microbial life in its hidden ocean.
Mimas, one of Saturn's moons, has a giant impact crater that gives it a striking resemblance to the fictional Death Star.
Iapetus, a two-toned moon of Saturn, has one hemisphere as dark as coal and the other bright and icy.
Iapetus also has an unusual ridge of mountains running along its equator, giving it a walnut-like shape unlike any other moon.
Hyperion, another of Saturn's moons, has a strange, spongy, deeply pitted appearance unlike anything else observed in the solar system.
Hyperion tumbles chaotically as it orbits Saturn, rather than rotating smoothly like most other moons.
Rhea, Saturn's second-largest moon, is composed largely of water ice and may have a very faint ring system of its own.
Saturn's north pole is capped by a bizarre, persistent hexagon-shaped jet stream, first spotted by the Voyager spacecraft in the early 1980s.
Saturn's hexagonal storm is so large that four Earths could fit inside it.
Scientists are still studying exactly why Saturn's polar jet stream settles into a six-sided hexagon rather than a circular shape.
Saturn experiences massive storms known as Great White Spots that erupt roughly once every Saturnian year, or about every 30 Earth years.
Winds in Saturn's atmosphere can reach speeds of over 1,100 miles per hour near the equator, among the fastest in the solar system.
Saturn's clouds are made largely of ammonia crystals, giving the planet its pale golden-yellow appearance.
Saturn radiates significantly more energy into space than it receives from the Sun, likely due to helium raining down through its interior.
Scientists think helium rain deep within Saturn releases friction-generated heat as it sinks toward the planet's core.
Saturn's magnetic field, while weaker than Jupiter's, is still hundreds of times stronger than Earth's.
Unusually, Saturn's magnetic field is nearly perfectly aligned with its rotational axis, unlike the magnetic fields of most other planets.
Saturn's mass is about 95 times that of Earth, despite its overall low density.
Saturn's gravity at its cloud tops is only slightly stronger than Earth's, roughly 1.07 times as strong.
Galileo Galilei first observed Saturn's rings through a telescope in 1610, though his equipment was too weak to reveal their true shape.
It wasn't until 1655 that astronomer Christiaan Huygens correctly identified Saturn's strange appendages as a flat ring surrounding the planet.
Pioneer 11 became the first spacecraft to fly past Saturn in 1979, paving the way for the more detailed Voyager missions that followed.
Voyager 1 and Voyager 2 both flew past Saturn in 1980 and 1981, sending back detailed images of its rings and moons.
NASA's Cassini spacecraft orbited Saturn from 2004 to 2017, becoming the first mission to orbit the ringed planet for an extended study.
The Cassini mission carried the Huygens probe to Titan and spent 13 years studying Saturn's rings, moons, and atmosphere up close.
Cassini ended its mission in 2017 with a deliberate "Grand Finale" plunge into Saturn's atmosphere, sending back data until the very last moment.
Cassini was intentionally destroyed in Saturn's atmosphere partly to prevent any risk of contaminating potentially habitable moons like Enceladus.
Saturn is bright enough to see with the naked eye and has been observed by skywatchers since ancient times.
Ancient Babylonian astronomers tracked Saturn's slow movement across the sky, associating it with their god Ninurta.
In Hindu astronomy, Saturn is known as Shani, associated with discipline and karma.
Through even a small backyard telescope, Saturn's rings are clearly visible, making it a favorite target for amateur astronomers.
Saturn's core is thought to be made of rock and ice, surrounded by thick layers of metallic and liquid hydrogen.
Some research suggests Saturn's core may be partially dissolved and diffuse rather than a sharply defined solid ball.
Saturn's average cloud-top temperature is a frigid -288°F (-178°C).
Saturn has faint auroras near its poles, driven by its magnetic field interacting with charged particles from the Sun.
Titan's thick atmosphere and low gravity mean a human wearing insulated wings could theoretically achieve powered flight there by flapping their arms.
Saturn's rings are made up of an estimated trillions of individual particles, ranging from dust-sized grains to house-sized chunks of ice.
Saturn's E ring, the widest of its rings, is fed continuously by the icy plumes erupting from Enceladus.
Small moonlets embedded within Saturn's rings can create propeller-shaped disturbances in the surrounding ring material.
Saturn's moon Pan orbits within a gap in the A ring and has a distinctive ridge around its equator, giving it a shape often compared to a ravioli.
Saturn's moon Daphnis creates visible waves in the edges of the Keeler Gap as its gravity disturbs nearby ring particles.
Some of Saturn's moons, called "trojan moons," share the same orbit as a larger moon, staying near stable points ahead of or behind it.
Tethys and Dione, two mid-sized moons of Saturn, each have small trojan companion moons sharing their orbital paths.
Saturn's moon system includes objects ranging from tiny ring-embedded moonlets to Titan, which is larger than the planet Mercury.
Many of Saturn's outer moons orbit backward relative to the planet's rotation, suggesting they were likely captured rather than formed alongside it.
Saturn's rings span an enormous width, over 170,000 miles across, yet contain relatively little total mass compared to the planet itself.
Saturn's atmosphere is banded like Jupiter's, though its bands are far more muted and harder to see due to a thick overlying haze.
Saturn's overlying haze layer is thought to be caused by chemical reactions between sunlight and hydrocarbons high in its atmosphere.
Saturn has no solid surface, so any spacecraft attempting to descend would sink through progressively denser layers of gas and liquid.
Saturn's low density means its overall gravitational pull, despite its huge size, is only a little stronger than Earth's at the cloud tops.
Data from Cassini suggested Saturn's rings may be much younger than the planet itself, possibly forming after the age of the dinosaurs on Earth.
Saturn's rings are gradually raining material down onto the planet, a process researchers call "ring rain," which may eventually deplete them.
Some estimates suggest Saturn's rings could disappear entirely within the next few hundred million years due to this ongoing ring rain.
Titan's dense atmosphere and thick orange haze make its surface completely invisible in ordinary visible-light photographs.
Radar and infrared instruments were needed to map Titan's surface features, since its haze blocks a direct view in visible light.
Titan's largest liquid methane sea, Kraken Mare, is estimated to be larger than several of the Great Lakes combined.
Because of Titan's thick atmosphere and low gravity, future robotic missions have proposed exploring it using floating boats or drone-like rotorcraft.
NASA's Dragonfly mission, planned to launch later this decade, aims to fly a nuclear-powered rotorcraft across Titan's surface to study its chemistry.
Saturn's axial tilt of about 27 degrees, close to Earth's, gives it seasons, though each one lasts more than seven Earth years.
As Saturn moves through its long orbit, the changing angle of sunlight on its rings makes them visibly brighten and dim over decades.
Enceladus is one of the most reflective objects in the solar system, its icy surface bouncing back almost all the sunlight that hits it.
Because Enceladus reflects so much sunlight, its surface stays extremely cold despite being warmed internally by tidal heating near its south pole.
Saturn's moon Phoebe orbits far outside the main moon system and backward compared to Saturn's rotation, suggesting it originated in the outer solar system.
Dust shed by Phoebe forms a giant, extremely faint outer ring around Saturn discovered by an infrared space telescope in 2009.
This outer Phoebe ring is so vast that if it could be seen with the naked eye, it would appear twice the size of the full Moon from Earth.
Saturn's moons range so widely in size and composition that scientists study them almost as a miniature solar system in their own right.
Saturn is the most distant planet from Earth that can still be easily seen with the naked eye under normal conditions.
New tiny moons of Saturn continue to be discovered using advanced tracking techniques, with dozens added to the official count in recent years.
Saturn's interior is thought to contain a layer of liquid metallic hydrogen, similar to Jupiter's, which helps generate its powerful magnetic field.
Saturn's rings can be divided into distinct sections separated by gaps carved out by the gravity of nearby moons.
The Encke Gap in Saturn's A ring is kept clear largely by the small moon Pan orbiting within it.
Saturn's overall appearance can shift subtly over its long year as storms, hazes, and cloud patterns evolve across the seasons.
Saturn's rings were once thought to be solid, until 19th-century mathematical analysis showed they must be made of countless small orbiting particles.
Astronomer James Clerk Maxwell won a prize in 1859 for mathematically proving that Saturn's rings could not be a single solid structure.
Saturn's largest moons are massive enough to be rounded into spheres by their own gravity, unlike its many small, irregularly shaped moonlets.
Data from the Cassini mission dramatically reshaped scientists' understanding of Enceladus, transforming it from an obscure ice ball into one of the solar system's top targets in the search for life.
Saturn remains one of the most photographed and studied planets in the solar system, thanks largely to the striking beauty of its ring system.
A day on Venus is longer than its year.
There are more stars in the observable universe than grains of sand on every beach on Earth.
The fastest known neutron stars spin at several hundred rotations per second.
The footprints astronauts left on the Moon will likely last for millions of years, since there's no wind or water to erode them.
One day on Mercury lasts about 176 Earth days.
Saturn is less dense than water, so it would float if you found a bathtub big enough.
The Sun accounts for about 99.86% of all the mass in the solar system.
Sunlight takes about 8 minutes and 20 seconds to reach Earth.
Space is silent: sound waves need a medium like air or water to travel, and space is a near-vacuum.
A full NASA spacesuit costs roughly $12 million.
Jupiter's Great Red Spot is a storm wide enough to fit the entire Earth inside it.
Venus is the hottest planet in the solar system, even hotter than Mercury, thanks to a runaway greenhouse effect.
The International Space Station circles Earth roughly once every 90 minutes.
Olympus Mons on Mars is the tallest known volcano in the solar system, more than twice the height of Mount Everest.
Neutron stars are so dense that a teaspoon of their material would weigh about a billion tons.
There are more possible chess games than atoms in the observable universe.
Uranus rotates almost on its side, with an axial tilt of about 98 degrees.
A year on Neptune lasts about 165 Earth years.
Astronauts can grow up to two inches taller in space as their spine decompresses in microgravity.
The Moon drifts about 3.8 centimeters farther from Earth every year.
The largest known star, UY Scuti, is so big that if placed where the Sun is, its surface would extend past Jupiter's orbit.
Black holes aren't cosmic vacuum cleaners: they only pull in matter that comes within their gravitational reach, just like any other massive object.
A day on Earth is very gradually getting longer as the Moon's gravity slows our planet's rotation.
The flags and equipment left on the Moon during the Apollo missions are still there today.
Mars has the largest dust storms in the solar system, sometimes engulfing the entire planet for weeks.
The Milky Way galaxy is on a collision course with the Andromeda galaxy, expected to merge in about 4.5 billion years.
There's a white dwarf star nicknamed "Lucy" that is largely crystallized carbon: essentially a planet-sized diamond.
Saturn's moon Titan has lakes and rivers, but they're made of liquid methane and ethane, not water.
Voyager 1, launched in 1977, is the most distant human-made object from Earth and is now traveling through interstellar space.
A single day on Jupiter lasts under 10 hours, the shortest of any planet in the solar system.
Venus has more volcanoes than any other planet in the solar system, with over 1,600 major ones identified.
Astronauts have described the smell lingering on their suits after spacewalks as similar to seared steak or hot metal.
There are more trees on Earth than stars in the Milky Way galaxy, according to some estimates.
Pluto's moon Charon is so large relative to Pluto that the two are sometimes considered a "double dwarf planet" system.
The Sun is so large that about 1.3 million Earths could fit inside it.
Neutron stars can have magnetic fields trillions of times stronger than Earth's.
Comets are sometimes called "dirty snowballs" because they're made of ice, dust, and rocky material.
Mercury has almost no atmosphere to trap heat, so its temperature swings from scorching hot to freezing cold between day and night.
Valles Marineris on Mars, the largest known canyon in the solar system, is more than four times longer than the Grand Canyon.
Astronauts' vision can change temporarily or permanently due to fluid shifts in the body during long stays in microgravity.
Europa, one of Jupiter's moons, is thought to have a saltwater ocean beneath its icy crust that may hold more water than all of Earth's oceans combined.
The first image of a black hole was captured in 2019 by the Event Horizon Telescope, showing the black hole at the center of galaxy M87.
A "shooting star" isn't a star at all: it's a small piece of space debris burning up as it enters Earth's atmosphere.
The Hubble Space Telescope has been orbiting Earth and capturing images of deep space since 1990.
Saturn's rings are made mostly of ice particles, with a smaller amount of rocky debris and dust.
The Boomerang Nebula is thought to be the coldest known place in the universe, colder than the background temperature of space itself.
It would take more than a thousand Earths to fill the volume of Jupiter.
The South Pole–Aitken basin, the largest known impact crater on the Moon, is roughly 1,600 miles across.
Astronauts on the International Space Station see about 16 sunrises and sunsets every 24 hours.
The term "planet" was formally defined by the International Astronomical Union only in 2006, which reclassified Pluto as a "dwarf planet."
Some exoplanets, like 55 Cancri e, are thought to be composed largely of carbon, potentially forming diamond in their interior under extreme pressure.
The Hercules–Corona Borealis Great Wall, one of the largest known structures in the universe, spans billions of light-years.
Stars twinkle because their light is bent by turbulence in Earth's atmosphere; planets appear to shine more steadily because they're closer and appear as tiny discs.
A black hole's "point of no return" is called the event horizon: nothing, not even light, can escape once past it.
The Apollo 11 guidance computer that helped land astronauts on the Moon had far less processing power than a modern smartphone.
Venus rotates in the opposite direction to most planets in the solar system, a phenomenon called retrograde rotation.
Ganymede, the largest moon in the solar system, is bigger than the planet Mercury.
Cosmic rays are high-energy particles from space that constantly strike Earth's atmosphere, some originating from distant supernovae.
The Sun loses millions of tons of mass every second through the solar wind and the energy it radiates.
Astronauts must exercise for about two hours a day in space to prevent muscle and bone loss caused by microgravity.
The asteroid belt between Mars and Jupiter contains millions of objects, but its total mass is still less than that of Earth's Moon.
A "supermoon" occurs when a full moon coincides with the Moon's closest approach to Earth in its orbit, making it appear slightly larger and brighter.
The first living creature sent into orbit was a dog named Laika, aboard the Soviet satellite Sputnik 2 in 1957.
Saturn isn't the only planet with rings: Jupiter, Uranus, and Neptune all have fainter ring systems too.
The James Webb Space Telescope observes the universe primarily in infrared light, letting it see through cosmic dust that blocks visible light.
A year on Mercury is shorter than a day on Mercury, since it orbits the Sun faster than it rotates.
Ceres, the largest known object in the asteroid belt, is also classified as a dwarf planet.
Black holes can theoretically "evaporate" over immense timescales through a process called Hawking radiation.
The Moon has no atmosphere, so the sky there appears black even during the lunar daytime.
Eris, one of the largest known dwarf planets beyond Neptune, is nearly as massive as Pluto itself.
The first artificial satellite, Sputnik 1, was launched by the Soviet Union in 1957, starting the Space Age.
Stars are made mostly of hydrogen and helium, the two lightest and most abundant elements in the universe.
The gravitational pull on the Moon is about one-sixth as strong as on Earth, letting astronauts leap much higher there.
A rogue planet can wander through space without ever orbiting a star.
A total solar eclipse can only happen during a new moon, when the Moon passes directly between the Sun and Earth.
The Kuiper Belt, a region beyond Neptune, is home to icy bodies including Pluto and many other dwarf planets and comets.
Light from some of the most distant galaxies we observe left its source billions of years before Earth even existed.
The Sun's core reaches temperatures of about 27 million degrees Fahrenheit (15 million degrees Celsius).
Astronauts' urine and sweat aboard the ISS are recycled into drinking water through advanced filtration systems.
Uranus is the coldest planet in the solar system, even though Neptune is farther from the Sun.
The word "astronaut" comes from Greek words meaning "star sailor."
A single teaspoon of a white dwarf star would weigh roughly as much as a small car due to its extreme density.
The first crewed Moon landing, Apollo 11, took place on July 20, 1969.
Comet tails always point away from the Sun, regardless of which direction the comet itself is traveling.
The Andromeda Galaxy is the most distant object visible to the naked eye from Earth, roughly 2.5 million light-years away.
A "blood moon" occurs during a total lunar eclipse, when Earth's atmosphere scatters sunlight and casts a reddish glow on the Moon.
Space debris, including old satellites and fragments, is tracked closely because even tiny pieces can damage spacecraft at orbital speeds.
The James Webb Space Telescope's mirror is made of 18 hexagonal gold-coated segments.
Mars has two small, irregularly shaped moons, Phobos and Deimos, thought to be captured asteroids.
It takes sunlight an estimated tens of thousands of years to travel from the Sun's core to its surface, but just over 8 minutes to then reach Earth.
The Great Red Spot on Jupiter has been shrinking in size over the past century, according to long-term observations.
In 1977, both Voyager spacecraft were launched carrying a "Golden Record" with sounds and images representing life on Earth.
Gravity is very slightly weaker on tall mountains than at sea level, though the difference is far too small for humans to notice.
Some scientists estimate there could be more planets than stars in the Milky Way galaxy.
Halley's Comet is visible from Earth roughly every 76 years, with its next appearance expected around 2061.
A "light-year" measures distance, not time: it's the distance light travels in one Earth year, about 5.9 trillion miles.
The Moon always shows the same face to Earth because its rotation and orbit are tidally locked at the same period.
The word "nebula" comes from the Latin word for "cloud," describing vast clouds of gas and dust in space where stars are often born.
The International Space Station has been continuously inhabited by rotating crews since November 2000.
Building and running the International Space Station is estimated to have cost more than $150 billion, making it one of the most expensive objects ever built.
Neptune has the fastest winds of any planet in the solar system, with gusts reaching up to 1,200 miles (2,000 kilometers) per hour.
Scientists believe it may literally rain diamonds deep inside Uranus and Neptune, where extreme pressure crushes carbon into crystals.
Mars looks red because its surface is covered in iron oxide, the same compound that gives rust its color.
Jupiter has more confirmed moons than any other planet in the solar system, with well over 90 discovered so far.
Venus is named after the Roman goddess of love and beauty, the only planet in the solar system named for a female figure.
Venus is often called Earth's "twin" because the two planets are close in size, mass, and composition.
Venus's diameter is about 7,521 miles (12,104 km), roughly 95% the size of Earth.
Venus's mass is about 82% of Earth's, and its surface gravity is roughly 90% as strong.
Despite its similarities to Earth in size, Venus's surface conditions are so hostile it's sometimes called Earth's "evil twin."
Venus takes about 243 Earth days to rotate once on its axis, longer than the roughly 225 Earth days it takes to orbit the Sun.
Venus rotates in the opposite direction to most planets, a phenomenon called retrograde rotation.
Because of its slow, backward rotation, the Sun on Venus rises in the west and sets in the east.
Scientists suspect a massive ancient impact may explain why Venus rotates backward compared to most other planets.
Venus's axial tilt is only about 3 degrees, far less than Earth's, so it experiences essentially no meaningful seasons.
Venus orbits the Sun at an average distance of about 67 million miles (108 million km).
Venus is the second planet from the Sun and the closest planet to Earth on average.
Venus has the most nearly circular orbit of any planet in the solar system.
Venus's surface temperature averages around 900°F (475°C), hot enough to melt lead.
Venus is the hottest planet in the solar system, even hotter than Mercury, which is actually closer to the Sun.
Venus's extreme heat comes from a runaway greenhouse effect, where its thick atmosphere traps solar heat far more effectively than Earth's does.
Venus's atmosphere is roughly 96% carbon dioxide, one of the main drivers of its intense greenhouse effect.
The surface pressure on Venus is about 92 times that of Earth, similar to the pressure found nearly a mile deep in Earth's oceans.
Venus's crushing atmospheric pressure alone would be enough to destroy most spacecraft not specifically engineered to withstand it.
Venus is permanently shrouded in thick clouds made largely of sulfuric acid droplets.
Venus's cloud layer reflects about 70% of the sunlight that strikes it, making the planet extremely bright in Earth's sky.
Venus is the brightest planet visible from Earth, and the third-brightest natural object in our sky after the Sun and Moon.
Venus is sometimes called the "Morning Star" or "Evening Star" because of how brightly it shines near sunrise or sunset.
Under the right conditions, Venus is bright enough to be spotted with the naked eye even during full daylight.
Venus's dense clouds permanently block any direct view of its surface at visible wavelengths, so it had to be mapped using radar.
NASA's Magellan spacecraft used radar to map more than 98% of Venus's surface in the early 1990s.
Venus has more volcanoes than any other planet in the solar system, with over 1,600 major volcanic features identified.
Some scientists believe parts of Venus may still be volcanically active today, based on changing sulfur dioxide levels detected in its atmosphere.
In 2023, reanalyzed Magellan radar images revealed what appeared to be an active volcanic vent on Venus that changed shape between observations.
Venus's surface is dominated by vast volcanic plains, covering more than 80% of the planet.
Venus has surprisingly few impact craters, suggesting its surface was resurfaced by volcanic activity relatively recently, geologically speaking.
Some scientists estimate that most of Venus's surface may be only around 300 to 500 million years old, remarkably young for a planetary surface.
Venus has two large highland regions, Ishtar Terra and Aphrodite Terra, sometimes compared to continents on Earth.
Venus's tallest mountain, Maxwell Montes, rises about 6.8 miles (11 km) high, taller than Mount Everest.
Maxwell Montes is one of the only surface features on Venus named after a man, honoring physicist James Clerk Maxwell.
By convention, almost every surface feature on Venus is named after a real or mythological woman, honoring the planet's namesake goddess.
Venus has no moons and no ring system, unlike most of the other major planets.
Venus's atmosphere is so thick that surface winds barely move, yet its upper clouds race around the planet in only about four Earth days.
This phenomenon, called super-rotation, means Venus's atmosphere circles the planet many times faster than the planet itself actually rotates.
Scientists still don't fully understand what drives Venus's atmospheric super-rotation, and it remains an active area of research.
High in Venus's atmosphere, roughly 30 miles up, temperatures and pressures become much closer to Earth-like conditions.
The relatively mild conditions in Venus's upper cloud layer have led some scientists to propose future floating habitats or balloon missions there.
Venus has virtually no detectable global magnetic field, unlike Earth's protective one.
Without a strong magnetic field, Venus's atmosphere is gradually stripped away by the solar wind, though its thick atmosphere makes the loss very slow.
Venus has a faint, induced magnetic field created indirectly by the interaction between solar wind and its upper atmosphere.
In 1962, NASA's Mariner 2 flew past Venus and became the first spacecraft to successfully reach another planet.
The Soviet Union's Venera 7 became the first spacecraft to successfully land on another planet when it touched down on Venus in 1970.
Venera 7 survived on the scorching Venusian surface for only about 23 minutes before its instruments failed under the extreme heat and pressure.
In 1975, Venera 9 sent back the first images ever taken from the surface of another planet.
Venera 13 transmitted the first color photographs from the surface of Venus in 1982, revealing an orange-tinted rocky landscape.
Venera 13 holds the record for the longest survival time on Venus's surface by a lander, lasting about two hours before succumbing to the heat.
The Soviet Union sent more successful landers to Venus than any nation has sent to any other planet's surface.
Japan's Akatsuki spacecraft has been studying Venus's atmosphere and weather patterns from orbit since 2015.
The European Space Agency's Venus Express orbiter studied the planet's atmosphere and climate from 2006 to 2014.
NASA has selected two new missions to Venus, DAVINCI and VERITAS, planned to study its atmosphere, geology, and surface composition in detail.
The European Space Agency's planned EnVision mission aims to study whether Venus is still geologically active today.
In 2020, an international team of astronomers reported a controversial detection of phosphine gas in Venus's clouds, a possible but disputed biosignature.
The phosphine detection on Venus sparked debate among scientists, and follow-up studies have produced conflicting results.
Some researchers have speculated that microbial life could theoretically survive in the more temperate upper cloud layers of Venus, though this remains unproven.
Venus's clouds are so acidic that any hypothetical life there would need to be radically different from anything found on Earth.
A rare astronomical event called a transit of Venus occurs when the planet passes directly between Earth and the Sun, visible as a small black dot crossing the solar disk.
Transits of Venus are extremely rare, occurring in pairs roughly eight years apart, separated by gaps of over a century.
The most recent transit of Venus took place in 2012; the next won't occur again until 2117.
Historic observations of Venus transits in the 18th and 19th centuries helped astronomers calculate the distance between Earth and the Sun.
Galileo Galilei's observation of Venus's phases in the early 1600s provided key evidence supporting the heliocentric model of the solar system.
Like the Moon, Venus goes through visible phases as seen from Earth, changing from a thin crescent to a full disk over months.
Ancient Mayan astronomers tracked Venus with remarkable precision, building an entire calendar system around its movements.
Many ancient cultures believed Venus's appearance as both a "morning star" and "evening star" meant it was actually two separate celestial objects.
In Babylonian astronomy, Venus was associated with the goddess Ishtar, linked to love and war.
In Hindu astronomy, Venus is known as Shukra, associated with beauty, wealth, and pleasure.
Venus is easily visible with the naked eye and requires no telescope to spot, making it one of the most recognized objects in the night sky.
Despite its brightness, Venus's dense cloud cover means even powerful telescopes reveal almost no surface detail in visible light.
Venus's clouds circulate in distinct layers, with different wind speeds and chemical compositions at different altitudes.
Lightning has been detected in Venus's atmosphere, though scientists debate exactly how frequently it occurs compared to storms on Earth.
Venus experiences no rainfall of liquid water, since its surface is far too hot for water to exist in liquid form.
Some scientists believe Venus may have once had oceans of liquid water billions of years ago, before a runaway greenhouse effect boiled them away.
If Venus once had oceans, their evaporation is thought to have contributed enormous amounts of water vapor, and eventually carbon dioxide, to its atmosphere.
Venus is sometimes studied by scientists as a cautionary example of how a runaway greenhouse effect can transform an Earth-like planet.
Venus's proximity to Earth makes it one of the easiest planets to reach with a spacecraft, even though its conditions are far harsher.
A one-way trip to Venus takes roughly four to five months using current spacecraft propulsion.
Venus is often used for gravity-assist maneuvers, helping spacecraft gain speed on their way to more distant destinations in the solar system.
NASA's Parker Solar Probe has used repeated gravity assists from Venus to gradually tighten its orbit toward the Sun.
Venus's dense atmosphere would make sound travel more efficiently there than on Earth, though the extreme heat and pressure would destroy any human instantly.
The pressure and heat on Venus's surface caused Soviet landers to be crushed and cooked within hours despite specialized heat shielding and pressure vessels.
Venus's surface is dry and largely free of the erosion patterns seen on planets with active weather involving liquid water.
Venus has unusual circular volcanic features called "coronae," formed by rising plumes of hot material pushing up from deep within the planet.
Venus also has flat-topped volcanic domes called "pancake domes," thought to form from thick, slow-flowing lava.
Venus lacks plate tectonics in the same style as Earth, and instead may release internal heat through periodic, planet-wide resurfacing events.
Some researchers propose that Venus experiences episodic upheavals, where large portions of its crust are resurfaced in relatively short geological bursts.
Venus's interior is thought to be similar to Earth's, with a core, mantle, and crust, though its exact internal structure remains uncertain.
Venus is close enough to Earth in size and composition that some scientists once assumed it might harbor jungles or oceans before spacecraft revealed the truth.
Early 20th-century science fiction often imagined Venus as a swampy, tropical world, an idea long since disproven by direct observation.
Venus is the only planet in the solar system whose day is longer than its year.
Because of its slow rotation, a person standing on Venus would experience roughly two sunrises for every Venusian year.
Venus's cloud tops reflect sunlight so effectively that the planet appears as a brilliant, featureless white-yellow disk through ordinary telescopes.
Ultraviolet imaging reveals streaky, banded cloud patterns on Venus that are completely invisible in normal visible light.
A mysterious ultraviolet-absorbing substance in Venus's clouds creates dark markings that scientists have never fully identified.
Venus's clouds sit at altitudes roughly 30 to 40 miles above the surface, far higher than most clouds on Earth.
Because Venus and Earth have similar sizes, scientists sometimes describe Venus's harsh evolution as a warning about the limits of planetary habitability.
Venus's proximity and brightness have made it one of the most observed and studied planets throughout human history.
Venus has no seasons in the traditional sense, since its nearly upright axial tilt means sunlight strikes the planet almost the same way year-round.
Venus's atmosphere contains a small percentage of nitrogen, the second most abundant gas after carbon dioxide.
Trace amounts of sulfur dioxide in Venus's atmosphere are closely monitored by scientists as a possible indicator of ongoing volcanic activity.
Venus's overall chemical makeup suggests it formed from similar raw material to Earth, making its dramatically different fate especially useful for comparative planetary science.
Because Venus's orbit lies inside Earth's, it always appears close to the Sun in the sky and is best viewed shortly after sunset or before sunrise.
Venus can occasionally be seen passing extremely close to other bright planets in the sky during rare planetary conjunctions.
Venus's high reflectivity, or albedo, is due almost entirely to its thick cloud deck rather than its actual rocky surface.
If Venus's clouds were stripped away, its underlying surface would likely appear as a dark, rocky landscape rather than the bright white disk seen from Earth.
Venus remains one of the least explored rocky planets in terms of surface landers, largely because of the extreme engineering challenges its environment poses.
Upcoming missions to Venus are expected to use radar and durable, heat-resistant designs to finally study its surface and atmosphere together in far greater detail.

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