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Jupiter:
A true-color image of Jupiter taken by the Cassini spacecraft. The Galilean moon Europa casts a shadow on the planet's cloud tops.
A true-color image of Jupiter taken by the Cassini spacecraft. The Galilean moon Europa casts a shadow on the planet's cloud tops.

Jupiter, the most massive planet in our solar system -- with dozens of moons and an enormous magnetic field -- forms a kind of miniature solar system. Jupiter does resemble a star in composition, but it did not grow big enough to ignite. The planet's swirling cloud stripes are punctuated by massive storms such as the Great Red Spot, which has raged for hundreds of years.

Featured Mission: Juno
NASA's Juno polar orbiter will study how Jupiter formed and became the dynamic world we see today. Juno will also help us to better understand the formation of our solar system and other planetary systems.

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Just the Facts
Orbit Size (semi-major axis):  778,340,821 km
Mean Radius:  69,911 km
Volume:  1,431,281,810,739,360 km3
Mass:  1,898,130,000,000,000,000,000,
000,000 kg
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Rosaly Lopes Rosaly Lopes
Mt. Etna's 1979 eruption turned Rosaly's studies to volcanism. "It was the most beautiful spectacle, and I was hooked on volcanoes from then on." Read More...
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Last Updated: 2 Jun 2011