Saturn vs Jupiter — The Two Giant Gas Planets Compared

Saturn and Jupiter are the two biggest planets in our solar system. They're neighbours, they're both made mostly of gas, and they look surprisingly similar in many photos. But once you start comparing them up close, the differences are almost as interesting as the similarities.

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Saturn and Jupiter side by side photographed by NASA spacecraft — both gas giants but very different in appearance
Saturn and Jupiter — the two gas giants compared. Jupiter is bigger and more colourful; Saturn has the famous rings.

Jupiter is bigger. Jupiter is much heavier.

Jupiter has the most famous storm in the solar system. But Saturn has the rings — by far the most spectacular ring system anywhere — and a six-sided jet stream at its north pole that no other planet has anything like.

Saturn has more moons. Jupiter has Ganymede, the biggest moon anywhere.

And the two planets are tied together in mythology too: in Roman stories, Jupiter was Saturn's son, and overthrew his father to become king of the gods. This page lays out, side by side, exactly how the two giant gas planets compare.

There is no single winner. Both planets are remarkable. But there are clear answers to the questions kids actually ask.

🌟 Quick answer: Saturn vs Jupiter — the headline differences

Jupiter is the bigger of the two — about 20% wider and over three times more massive. Jupiter has the famous Great Red Spot, a giant storm bigger than Earth.

Saturn has the spectacular rings (Jupiter has rings too, but they are thin and dark, almost invisible). Saturn has about 285 confirmed moons (May 2026); Jupiter has 115.

Jupiter has the biggest moon in the whole solar system — Ganymede, which is bigger than the planet Mercury. Saturn has Titan, which is also bigger than Mercury, and a hidden ocean inside the small moon Enceladus.

The two planets are both made mostly of hydrogen and helium gas — but Saturn is so puffed up that, if you could find a bath big enough, it would actually float on water. Jupiter would sink.

The headline comparison

Saturn and Jupiter, side by side, on the things that matter most.

FeatureSaturnJupiter
Order from the Sun6th planet5th planet
Distance from the Sun (avg)1.43 billion km (9.5 AU)778 million km (5.2 AU)
Diameter at equatorAbout 120,500 km (9.5 Earths)About 142,800 km (11.2 Earths)
Mass95 × Earth's mass318 × Earth's mass
Density0.687 g/cm³ (less dense than water)1.33 g/cm³ (denser than water)
Day lengthAbout 10 hours 33 minutesAbout 9 hours 56 minutes
Year length29.5 Earth years11.9 Earth years
Surface gravity (at cloud tops)1.07 × Earth's gravity2.53 × Earth's gravity
Made ofMostly hydrogen and helium gasMostly hydrogen and helium gas
Cloud coloursPale cream and gold stripesBold orange, white, brown, red stripes
Famous stormThe hexagon at the north pole (and 'Great White Spots' every ~30 years)The Great Red Spot — at least 350 years old, bigger than Earth
RingsHuge, bright, spectacular — visible from Earth with a small telescopeThin, dark, dust-only — invisible from Earth
Confirmed moons (May 2026)At least 285 (most of any planet)At least 115
Biggest moonTitan (5,150 km wide — bigger than Mercury)Ganymede (5,268 km wide — bigger than Mercury, and the biggest moon in the solar system)
Most famous missionCassini-Huygens (orbited 2004-2017)Juno (currently orbiting since 2016)
Roman godSaturn — agriculture, harvest, the Golden AgeJupiter — king of the gods (Saturn's youngest son)

The family resemblance

Before the differences, let's start with what Saturn and Jupiter have in common — because it's a lot. Both planets are gas giants.

That means both are made almost entirely of hydrogen and helium gas, with no solid surface that a spacecraft could land on. If you tried to fly down into either of them, you would just keep falling through thicker and thicker gas until the pressure crushed you, long before reaching anything solid (and there may be no truly solid surface in either case, just super-pressurised exotic states of matter deep in the core).

Both planets are huge. Saturn is wide enough to fit about 9 Earths side by side; Jupiter is wide enough for about 11.

Both have powerful magnetic fields, both spin fast (giving them days less than 11 hours long), and both have stripes of cloud running parallel to their equators. Both have rings (though Jupiter's are almost invisible — more on that later).

Both have lots of moons — together, the two gas giants account for roughly 80% of all the moons in the solar system. And both share a deep family connection with the Sun: as the two biggest planets, they formed first, when the solar system was young, and they hoovered up most of the leftover material before the smaller rocky planets like Earth could even take shape.

So if you ever see Saturn and Jupiter together in a telescope or in a photograph, they really do look like cousins — two big stripy worlds, both gas, both with families of moons swirling around them. The differences only become clear when you zoom in.

💡 Did you know?

Between them, Saturn and Jupiter contain more than 90% of all the planet mass in the solar system besides the Sun. Every other planet — Mercury, Venus, Earth, Mars, Uranus, Neptune — added together makes up less than 10% of the total. The Sun made the planets out of leftover gas and ice, and the two biggest gas giants grabbed nearly all of it.

Size — Jupiter wins, but not by as much as you might think

Saturn and Jupiter shown to scale, with Jupiter slightly larger than Saturn
Jupiter (left) and Saturn (right) to scale — Jupiter is about 20% wider but more than 3 times as heavy.

Jupiter is the biggest planet in the solar system. Saturn is the second biggest. So Jupiter wins this round — but the gap is smaller than most people expect.

Jupiter's diameter is about 142,800 km. Saturn's is about 120,500 km. So Jupiter is wider than Saturn by about 22,000 km — only about 18% bigger across. If you lined them up side by side, Jupiter would look like a slightly larger ball, but you wouldn't immediately say one was a giant next to a small thing.

Both are obviously gas giants. Both dwarf the Earth (which is only about 12,750 km across).

Where Jupiter really pulls ahead is in mass — how much stuff it actually contains. Jupiter weighs about 318 times as much as Earth.

Saturn weighs only about 95 times as much as Earth. So Jupiter has more than three times as much material crammed into it as Saturn, even though it's only a little wider.

That's because Jupiter is much denser than Saturn — which brings us to one of the most surprising facts in the solar system.

Density — Saturn would float (and Jupiter wouldn't)

Density measures how much stuff is packed into each cubic metre of a planet. Earth is fairly dense — about 5.5 grams per cubic centimetre — because we have a heavy iron core and rocky mantle. Water has a density of exactly 1.0 g/cm³. Anything less dense than water will float on it. Anything denser will sink.

Jupiter's density is 1.33 g/cm³ — denser than water. Jupiter would sink. Saturn's density is just 0.687 g/cm³ — less than two-thirds the density of water. If you could find a bath big enough to hold Saturn (you can't, but if you could), Saturn would actually float.

🎬 Imagine this

Picture a giant cosmic bathtub, somehow bigger than the planet Saturn itself. Now drop Saturn in.

Saturn would bob to the top, just like a beach ball floating in a swimming pool. Drop Jupiter in — and Jupiter would sink to the bottom.

Saturn is the only planet in our solar system with this strange property: it is, on average, lighter than water. Of all the gas giants, Saturn is the puffiest, and most spread out for its size.

Why the difference? Both planets are made mostly of the same stuff — hydrogen and helium gas.

But Jupiter is so massive that its own gravity squeezes the gas in its interior into a much denser state than Saturn's gravity can manage. Deep inside Jupiter, the pressure is so high that hydrogen turns into a strange exotic form called metallic hydrogen — a liquid that conducts electricity like a metal.

Saturn has metallic hydrogen too, but a smaller layer of it. So Jupiter is heavier per cubic metre, and Saturn stays surprisingly fluffy.

Rings — Saturn wins, by a country mile

Saturn's bright rings compared to Jupiter's faint nearly invisible ring system
Saturn's bright rings (left) vs Jupiter's dusty, faint rings (right) — Saturn wins by a wide margin.

This is the one almost everyone gets right. Saturn has the most spectacular ring system in the solar system. Through any small telescope, the rings are unmistakable — bright, broad, beautifully clear. Jupiter has rings too, but you would never know it just by looking at the planet.

Jupiter's rings are real but they are thin and dark. They are made mostly of fine dust, kicked off Jupiter's small inner moons by tiny meteor impacts.

The Voyager 1 spacecraft discovered Jupiter's rings in 1979 (around the same time it was on its way to Saturn). They are so faint that they are essentially invisible from Earth, even with a powerful telescope.

By contrast, Saturn's rings stretch about 280,000 km across, are made of countless billions of pieces of bright ice (the largest the size of houses, the smallest the size of grains of sugar), and are spectacular even in a back-garden telescope.

Why does Saturn have such impressive rings, when Jupiter does not? The honest answer is: scientists are still working it out.

The leading idea is that Saturn's rings were created relatively recently — perhaps only 100 million years ago — when one of Saturn's moons broke up. Saturn's lower density and slightly cooler environment then allowed those ice fragments to spread out and stay sparkly.

Jupiter, being closer to the Sun and more violent in its inner-moon system, never built up the same bright icy collection. Saturn's rings are also a temporary feature — they will eventually fall down into the planet over the next few hundred million years.

We are lucky to live in the age that has them.

Take the full tour of Saturn's ring system — every ring named.

Storms — Jupiter has the biggest, Saturn has the strangest

Both gas giants have wild weather. Both have layers of stripy cloud and high-speed winds. But each planet has one signature storm that the other does not have.

Jupiter's Great Red Spot

Jupiter's most famous feature is the Great Red Spot — a giant red oval storm in the planet's southern hemisphere. It has been continuously observed since at least 1830, and possibly since 1665.

That makes the Great Red Spot at least 200 years old, and possibly more than 350 years old. It is a hurricane-like storm rotating once every six days, with winds at the edges of around 432 km/h.

The Great Red Spot is bigger than the entire planet Earth — though it has been shrinking over the past century, and is now somewhat smaller than it used to be.

Saturn's hexagon

Saturn's most famous storm feature isn't a single spot — it's a giant six-sided cloud pattern around the north pole, called the hexagon. The hexagon is a jet stream of cloud flowing in a perfectly hexagonal path, wider than two Earths side by side.

The winds inside it blow at around 320 km/h. No other planet in the solar system has a polygon-shaped feature like it.

The hexagon was first photographed by the Voyager spacecraft in the early 1980s and studied in detail by Cassini for 13 years.

So which is the more impressive storm? It depends on what you mean. Jupiter's Great Red Spot is bigger, older, and faster-winded. Saturn's hexagon is more unique — there isn't another one anywhere in the solar system. Both are honestly amazing, in different ways.

Explore Saturn's giant six-sided jet stream at the north pole.

Moons — Saturn wins on count, but Jupiter has the heavyweights

Saturn's moon system vs Jupiter's moon system — Saturn has many more small moons but Jupiter has the four giant Galilean moons
Saturn has at least 285 moons; Jupiter has 101. But Jupiter has the four giant Galilean moons.

This is the comparison that has shifted most in recent years. For most of history, Jupiter was thought to have more moons than Saturn — that was the natural assumption, since Jupiter is bigger and has stronger gravity. But improvements in telescope technology have flipped the picture completely.

As of May 2026, Saturn is officially known to have at least 285 confirmed moons. Jupiter has at least 115.

Saturn pulled ahead because of two huge announcements: 128 new Saturn moons confirmed by the IAU in March 2025, then another 11 in March 2026. Jupiter is also growing — it added 4 new moons in March 2026 and another 14 in April 2026 — but Saturn is still well ahead.

Both numbers will keep climbing as telescope surveys go deeper.

But it's not just about counting. The two systems have very different shapes:

Jupiter's big four — the Galilean moons

Jupiter's most famous moons are the four giant ones discovered by Galileo Galilei in 1610: Io, Europa, Ganymede, and Callisto. All four are large enough to be planet-like in their own right.

Ganymede is the biggest moon in the whole solar system — bigger than Mercury. Europa has a hidden ocean and is one of the top places anyone is searching for alien life.

Io is the most volcanically active world anywhere — covered in sulphur volcanoes that erupt constantly. Each Galilean moon is a destination scientists desperately want to revisit.

Saturn's two stars — Titan and Enceladus

Saturn has Titan, which is bigger than Mercury and the only moon in the solar system with a thick atmosphere. Titan has methane lakes, methane rain, an orange smog-filled sky, and it is one of the most interesting worlds in the solar system.

Saturn also has Enceladus, a small icy moon with a global hidden ocean underneath its surface — geysers of salty water shoot from its south pole into space. Plus, Saturn has a whole crowd of mid-sized icy moons (Rhea, Iapetus, Dione, Tethys, Mimas) and hundreds of small irregular ones.

So: Jupiter has Ganymede (biggest single moon), four spectacular Galilean worlds, and a smaller total count. Saturn has more total moons, Titan and Enceladus as headline science destinations, and a much larger crowd of small irregular satellites.

Meet the moons themselves: Titan and Enceladus.

Missions — both planets have been visited many times

Both gas giants have been visited by spacecraft from Earth, though in slightly different ways. Both have been flown past by the same set of early missions: Pioneer 10 and Pioneer 11 (Pioneer 11 went on to Saturn after Jupiter), and both Voyager 1 and Voyager 2 (both visited Jupiter on the way to Saturn). After that, the two planets diverged.

Jupiter got the Galileo orbiter, which arrived in 1995 and studied Jupiter and its moons for eight years. Then it got Juno, a NASA mission that has been orbiting Jupiter since 2016 — still working as of 2026 — focused on Jupiter's deep interior and the polar regions, including the strange clusters of storms at Jupiter's north and south poles.

The European Space Agency has a mission called JUICE on its way to Jupiter now, due to arrive in 2031. And NASA's Europa Clipper, launched in 2024, will reach Jupiter in 2030 to study the icy moon Europa in detail.

Saturn got Cassini-Huygens — the international mission that orbited Saturn for 13 years, dropped the Huygens probe onto Titan in 2005, and made the close-up discoveries of Enceladus's geysers and the hexagon's true nature. Cassini's mission ended in September 2017 when it was deliberately destroyed by being flown into Saturn's atmosphere. The next mission to Saturn is Dragonfly — a nuclear-powered helicopter that will arrive at Titan in 2034.

Explore: the Pioneer and Voyager flybys · the Cassini-Huygens mission.

Mythology — Jupiter overthrew Saturn

Here's the part that surprises a lot of kids: the two planets are connected in mythology too. The Romans matched each of their wandering stars to one of their gods.

Saturn (the planet) was named after Saturn, the Roman god of farming, harvest, time, and a long-ago Golden Age. Jupiter (the planet) was named after Jupiter, the Roman king of the gods — the god of thunder, sky, and the storm.

And the two gods were related: in Roman mythology, Jupiter is Saturn's youngest son.

The story is this: Saturn was warned that one of his children would one day overthrow him, just as he had overthrown his own father. So Saturn tried to stop that prophecy.

His wife Ops (or Rhea in Greek mythology) tricked him, and saved their youngest son. That son was Jupiter (Zeus, in Greek).

When Jupiter grew up, he came back and led the younger generation of gods against his father, defeated him, and became the new king of the gods. Saturn then fled to Italy and brought a Golden Age there.

The same story is told in Greek mythology, but with the names Cronus (Saturn) and Zeus (Jupiter).

So in a strange way, the order of the planets — Saturn the sixth planet, Jupiter the fifth — puts the son in front of the father in the solar system. The bigger, more famous, more powerful planet (Jupiter) is named after a god who took the throne from his father.

The smaller, fluffier, more graceful planet (Saturn) is named after the older god who lost the war but ruled in peace afterward. Whether the Romans planned the connection or not, the mythology fits the science strangely well.

Read the full story: Saturn in mythology — the god, the festival, and how the moons got their names.

So which planet is better?

Trick question. They are both extraordinary, in completely different ways.

Jupiter is the biggest, the heaviest, the most chemically active, the host of the longest-running storm in the solar system, and home to four worlds (the Galilean moons) that are each a story of their own. Saturn is the most graceful, the puffiest, the host of the most spectacular ring system anywhere, the only planet with a hexagonal storm, the planet with the most moons, and home to two of the most interesting habitability targets in the solar system (Titan and Enceladus).

If you had to pick just one to visit, you'd be lucky either way. And if you take a small telescope outside on any clear night when both are above the horizon, you can see both of them tonight — Jupiter, bright and steady; Saturn, smaller, gold-coloured, with its rings unmistakably sticking out the sides. Two giant gas planets, two different stories, both right there in the same sky.

📌 Mini recap — Saturn vs Jupiter in one place

Saturn vs Jupiter — frequently asked questions

Quick answers to the most common questions.

Is Saturn bigger than Jupiter?

No. Jupiter is bigger than Saturn. Jupiter is about 142,800 km wide; Saturn is about 120,500 km wide. So Jupiter is about 18% wider across, and over three times more massive overall. Both are gas giants, and both dwarf the rocky planets like Earth.

Why is Saturn lighter than Jupiter even though they're made of similar things?

Because Jupiter is so massive that its own gravity squeezes the gas inside it into a much denser state than Saturn's gravity can. Both planets are mostly hydrogen and helium, but Jupiter's interior is heavily compressed. Saturn's interior is fluffier. Saturn's average density is about 0.687 g/cm³, less than water; Jupiter's is about 1.33 g/cm³, denser than water.

Does Jupiter have rings like Saturn?

Yes, Jupiter does have rings — but they are very different from Saturn's. Jupiter's rings are thin, dark, and made of fine dust kicked off Jupiter's small inner moons. They are essentially invisible from Earth. Saturn's rings are huge, bright, made of icy chunks, and easily visible through a small back-garden telescope. Saturn wins the ring comparison by a huge margin.

Which planet has more moons, Saturn or Jupiter?

Saturn — by quite a lot, as of May 2026. Saturn has at least 285 confirmed moons. Jupiter has at least 115. Saturn took the lead after the IAU recognised 128 new Saturn moons in March 2025, and another 11 in March 2026. Jupiter also gained moons (4 in March 2026 and 14 more in April 2026), but Saturn is still well ahead.

What's bigger, the Great Red Spot or Saturn's hexagon?

The Great Red Spot is the biggest single storm. It is wider than the entire Earth. Saturn's hexagon is a jet stream of cloud (not a single storm spot), and it is wider than two Earths placed side by side — so the hexagon covers more total surface area than the Great Red Spot. They are different kinds of weather features, so comparing them is a bit like comparing a hurricane and a jet stream. Both are remarkable.

How old is the Great Red Spot?

At least 200 years, and possibly more than 350 years. The storm has been continuously observed since 1830, and there are records from 1665 that may describe the same feature. That makes it the longest-lived storm anywhere in the solar system that we know of. It is also shrinking — over the past century it has gotten noticeably smaller, though it is still bigger than Earth.

What is the biggest moon in the solar system?

Ganymede — one of Jupiter's four big Galilean moons. Ganymede is about 5,268 km across, slightly bigger than the planet Mercury. Saturn's biggest moon, Titan, comes second at about 5,150 km — also bigger than Mercury. So both Saturn and Jupiter have at least one moon bigger than a planet.

Why does Saturn have the bigger ring system?

Scientists are still working on this, but the leading idea is that Saturn's rings are surprisingly young — perhaps only 100 million years old, formed when one of Saturn's moons broke up. Saturn's lower density and slightly cooler environment let the resulting icy debris spread out into the spectacular ring system we see today. Jupiter, being closer to the Sun and more violent in its inner-moon area, never built up the same bright icy collection.

Why does Jupiter have the more colourful clouds?

Because Jupiter is warmer and has more chemistry happening in its atmosphere. The bright orange, red, and white bands come from complex chemical compounds that form at Jupiter's higher temperatures. Saturn is colder, so its clouds stay paler and more peaceful-looking. Both planets have the same kind of stripy banded structure — Jupiter just has the more dramatic paint job.

Are Saturn and Jupiter related in mythology?

Yes. In Roman mythology, Jupiter is Saturn's youngest son. Saturn was warned that one of his children would overthrow him. His wife Ops saved their baby Jupiter from being eaten, and when Jupiter grew up, he led the younger gods against his father and took the throne. The same story is told in Greek mythology with the names Cronus (Saturn) and Zeus (Jupiter).

Can I see both Saturn and Jupiter in the night sky?

Yes, both planets are easy to find with the naked eye when they are above the horizon. Jupiter is brighter and easier to spot — usually one of the brightest objects in the night sky after the Moon and Venus. Saturn is a bit fainter, gold-coloured, and steadier (no twinkling). Use a free sky app like Stellarium to find both. Through a small telescope, Jupiter shows its cloud bands and four big moons; Saturn shows its rings clearly.

Mini quiz — test your gas-giant knowledge

Try these without scrolling back up. (Answers below.)

🧠 Quiz
✅ Quiz answers

1) Jupiter — about 18% wider than Saturn, and over three times more massive.

2) Saturn — its average density is about 0.687 g/cm³, less than water (which is 1.0 g/cm³).

3) Mercury — both Titan and Ganymede are slightly bigger than the planet Mercury.

4) At least 285 (any answer in the 255-315 range is fine — the count is growing).

5) The Great Red Spot.

6) Hexagonal — six-sided. Saturn's north-pole jet stream flows in a six-sided shape, unique in the solar system.

7) False. Jupiter does have rings, but they are thin and dark — made of fine dust — and essentially invisible from Earth. Saturn's rings are the spectacular ones.

8) Jupiter is Saturn's youngest son. Jupiter overthrew his father to become king of the gods.

9) Saturn would float — it is less dense than water (about 0.687 g/cm³). Jupiter would sink — it is denser than water (about 1.33 g/cm³). Jupiter is more squeezed-together by its own gravity.

10) Many good answers. Saturn-wins: the rings (way bigger and brighter); the hexagon (unique); more moons; less dense / fluffier. Jupiter-wins: bigger overall; more massive; the Great Red Spot (the oldest and biggest single storm in the solar system); contains Ganymede, the biggest moon anywhere; closer to Earth so easier to study with telescopes.

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Sources and last updated

This page is fact-checked against current sources from NASA, ESA, and peer-reviewed planetary science.

📚 Sources used on this page

Last updated: May 2026. Current moon counts (Saturn at least 285; Jupiter at least 115) verified against IAU Minor Planet Center as of April 2026.

Density, mass, radius, day, and year for both planets verified against NASA Planetary Fact Sheets. Great Red Spot age and Saturn hexagon details verified against current peer-reviewed planetary science.

Moon counts and ring/storm status reviewed quarterly.

Written and fact-checked by the Planets for Kids editorial team.

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