The planets were probably created by collisions between smaller rocky bodies over many millions of years. The identification of a recently formed asteroid family will tell us much about the dynamics of these collisions.
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Richardson, D. Rocks that go bump in the night. Nature 417, 697–698 (2002). https://doi.org/10.1038/417697a
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DOI: https://doi.org/10.1038/417697a
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