Beyond the asteroid belt lie the giant planets, worlds so large and cold that they seem to belong to a different solar system. Jupiter, the biggest, could swallow more than a thousand Earths and is wrapped in bands of cloud with a storm larger than our planet that has raged for centuries. Saturn is famous for its rings, made of countless pieces of ice ranging from dust grains to boulders. Uranus spins on its side, probably because of an ancient collision, and Neptune, the most distant, has winds that exceed two thousand kilometers per hour. Both of the outer pair are often called ice giants because of the water, ammonia, and methane in their interiors.
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