Why do the planets in the solar system orbit on the same plane?

Feb 19, 2020
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The Earth is about 4.5 billion years old. Liquid water and rocks were present by at least 3.8 Byr-ago. along with rare-earth elements. At what point does the flat "dust" in the solar system become planet building materials...silicates and other rock-forming minerals, not just gases.
 

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