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Jupiter, Saturn, Uranus and Neptune
The four giants. Jupiter and Saturn are gas giants. Uranus and Neptune are ice giants, smaller and built around heavier ices. The figures below are the ones already used on this site, dated and cited, not a new tally.
See Jupiter in 3DCompare diameters
Distances appear here once the in-browser model runs.
Side by side
| Jupiter | Saturn | Uranus | Neptune | |
|---|---|---|---|---|
| Kind | Gas giant | Gas giant | Ice giant | Ice giant |
| Equatorial diameter | 142,984 km | 120,536 km | 51,118 km | 49,528 km |
| Earth = 1 | 11.21 | 9.45 | 4.01 | 3.88 |
| Mass (1024 kg) | 1,898 | 568 | 86.8 | 102 |
| Density (kg/m³) | 1,326 | 687 | 1,270 | 1,638 |
| Known moons | 115 | 293 | 28 | 16 |
| Rings | Faint, dusty | Bright water-ice rings | 13 narrow dark rings | Faint rings |
| In 3D | Cloud descent | Ring flight | Dark-ring flight | Storm flight |
Diameters, masses and densities are the NASA Planetary Fact Sheet values already published on the sizes and distances page. Moon counts for Jupiter and Saturn follow NASA Science as of 2026 (Saturn as of August 2026). The Fact Sheet still lists 95 and 274. Uranus and Neptune follow that sheet: 28 and 16. Counts change when new moons are confirmed.
What they are made of
Jupiter and Saturn are mostly hydrogen and helium. Neither has a solid surface you could stand on; the atmosphere simply gets denser with depth. Saturn is the least dense planet. At 687 kg/m³ it sits below water, which is why people say it would float, if an ocean could hold it. Its rings are mostly water ice, about 270,000 km across and often only tens of metres thick.
Uranus and Neptune wear a hydrogen-helium atmosphere, with methane that takes out red light and leaves them blue-green and blue. Under the clouds, much of Uranus is thought to be a hot, dense fluid of water, methane and ammonia. Neptune is a little smaller than Uranus and more massive, and it carries the fastest winds described on this site, up to about 2,000 km/h. Uranus has 13 known rings, narrow and dark, and rolls around the Sun on its side, an axis tilt of about 97.8°. Neptune’s rings are faint.
See them moving
The 3D explorer can focus each giant: Jupiter, Saturn, Uranus, Neptune. That scene compresses size and distance unless you switch on real scale, and its starting angles are not a live ephemeris. For where they are tonight, use planets visible tonight and the distance table. For globes drawn to scale, use which planet is bigger.
Frequently asked questions
Which of these worlds is the largest?
Jupiter, 142,984 km across and 1,898 × 10²⁴ kg. Saturn is next in size. Neptune is smaller than Uranus but more massive: 102 against 86.8 × 10²⁴ kg.
What is the difference between a gas giant and an ice giant?
Jupiter and Saturn are gas giants, made mostly of hydrogen and helium, with no solid surface. Uranus and Neptune are ice giants: a hydrogen-helium atmosphere over a deep hot fluid of water, methane and ammonia.
How many moons do they have?
As of 2026, NASA Science lists 115 IAU-recognized moons for Jupiter and 293 confirmed moons for Saturn, as of August 2026. The NASA Planetary Fact Sheet still lists 95 and 274, and lists 28 for Uranus and 16 for Neptune. Counts change as new moons are confirmed.
Which has the brightest rings?
Saturn. Its main rings span roughly 270,000 km and are made mostly of water ice, often only tens of metres thick. Jupiter’s rings are faint and dusty. Uranus has 13 known rings, narrow and dark. Neptune’s rings are faint.
Is Saturn less dense than water?
Yes. The NASA Planetary Fact Sheet density used on this site is 687 kg per cubic metre, below water at about 1,000. There is no ocean large enough to test it.
Can I see them in 3D?
Yes. Open Jupiter, Saturn, Uranus or Neptune in the explorer, or the expeditions that descend into Jupiter, fly the rings of Saturn and Uranus, and fly Neptune’s storms.
Sources: NASA Science — Jupiter moons · NASA Science — Saturn moons · NASA Planetary Fact Sheet · ring and interior descriptions as already stated on this site’s Jupiter, Saturn, Uranus and Neptune pages. Moon counts dated 2026.