It seems that Mars had grown to near its present size by 2 million to 4 million years after the Solar System began to form. Such rapid growth explains why the planet is much smaller than Earth and Venus. See Letter p.489
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Brandon, A. Building a planet in record time. Nature 473, 460–461 (2011). https://doi.org/10.1038/473460a
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DOI: https://doi.org/10.1038/473460a