Jupiter (Planet) — Facts, Moons, Atmosphere, and Exploration
Jupiter is the largest planet in the Solar System and a gas giant with powerful winds, giant storms, and a rich moon system. Its gravity influences nearby asteroid and comet paths.
Quick Facts
| Planet type | Gas giant |
|---|---|
| Mean radius | 69,911 km |
| Mass | 1,898 × 10^24 kg |
| Gravity | 24.8 m/s² |
| Average temperature | -110°C (cloud tops) |
| Length of day | 9.9 hours |
| Length of year | 11.9 Earth years |
| Number of moons | 95 |
| Rings | Yes (faint) |
| Distance from Sun (AU) | 5.20 |
What Makes Jupiter Unique
Jupiter's scale is striking: it contains more mass than all other planets combined. Its Great Red Spot is a giant long-lived storm, and its deep atmosphere shows colorful cloud bands linked to fast jet streams.
Jupiter also hosts strong radiation belts and a powerful magnetic field that shape the space environment around the planet.
Atmosphere and Weather
Jupiter's atmosphere is mostly hydrogen and helium, with traces of methane, ammonia, and water compounds. Rising and sinking gases form banded cloud layers and storms of many sizes. Winds can exceed hundreds of kilometers per hour.
Because Jupiter lacks a solid surface like Earth's, atmospheric patterns extend deep into the planet.
Moons and Rings
Jupiter has many moons, including the four large Galilean moons: Io, Europa, Ganymede, and Callisto. These worlds are major science targets because they include volcanic activity, subsurface oceans, and ancient cratered terrains. Jupiter also has a thin, dusty ring system.
Exploration Highlights
Pioneer and Voyager missions first revealed Jupiter in detail. Galileo orbited Jupiter and studied moons up close, while Juno currently investigates the planet's interior structure, magnetic field, and atmospheric dynamics. Upcoming missions to Jupiter's moons expand the search for potentially habitable environments beyond Earth.
If You Like Jupiter
Try Saturn for ring science, Neptune for a windy ice giant comparison, and Mars to contrast giant and rocky planets.
Description of Jupiter
Jupiter is a huge striped planet made mostly of gas, with swirling clouds, intense storms, and a powerful magnetic field. It dominates the outer Solar System and acts as a major gravitational influence on nearby moons, asteroids, and comets.
Its strong pull also makes it a good reference in gravity comparisons. You can see how much heavier a person would feel there in What Would You Weigh on Other Planets?.
Is Jupiter a Gas Giant?
Yes, Jupiter is a gas giant. It is classified this way because it is enormous, has no solid surface like a rocky planet, and is made mainly of hydrogen and helium with deep atmospheric layers.
FAQ
Can Jupiter become a star?
No. Jupiter is massive for a planet, but far too small to start the sustained nuclear fusion that powers stars.
Does Jupiter protect Earth from impacts?
Jupiter can deflect or capture some objects, but its gravity can also redirect others inward. Its net effect is complex.
Is there a solid surface on Jupiter?
There is no simple rocky surface like Earth's; pressure rises with depth through thick layers of gas and fluid states.
What is Jupiter?
Jupiter is the largest planet in the Solar System and a giant world made mostly of hydrogen and helium.
Is Jupiter a gas giant?
Yes. Jupiter is the biggest gas giant in the Solar System.
Why is Jupiter so large?
Jupiter formed in the outer Solar System, where enough material was available for it to build a massive core and capture large amounts of gas.