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The early solar system comprised of a disk of gas which was hot near the newly formed protosun (about 2000 degrees Kelvin) and cooler at further distances. Rocky substances condensed at the higher (inner) temperatures, while icy substances condense at much lower temperatures further out (about 200 degrees Kelvin) and hydrogen and helium at lower temperatures still - just above absolute zero.

Gas collected together in the outer part of the solar system to form the four gas giant planets, while rocks collected together in the inner part of the solar system to form the four inner planets, which included the earth. Early on, there was a lot of smaller pieces of rock, and a lot of collisions, but this eventlly settled down as the planets formed.

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14y ago

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