Jupiter s atmosphere is made mostly of helium and hydrogen. Jupiter has 17 known moons. Galileo discovered four of Jupiter s moons, which are Io, Europa, Ganymede, and Callisto. Jupiter is probably most famous from its Great Red Spot. The Great Red Spot is a violet storm on Jupiter.
Many violent storms occur on Jupiter.
Saturn is the second largest planet in the solar system. Saturn has a thick atmosphere made up of mostly hydrogen and helium. Saturn is the only planet in the solar system that is less dense than water. Saturn is surrounded by beautiful rings made of chunks of rocks and ice. Uranus is 2,871,000,000km from the sun.