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The top documents tagged [moonmars sized protoplanets]
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Introductory Astronomy Our Moon – and History 1. We’ve Been There! 12 humans have visited the Moon Brought back samples Left experiments What have we
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Introductory Astronomy History – Solar Nebula 1. Dust to Planetesimals Grains of dust (solids) collide and adhere Larger grains grow to 10 9 planetesimals
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Introductory Astronomy
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