Definition of planetesimal hypothesis
: a hypothesis in astronomy: the planets have evolved by aggregation from planetesimals
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“Planetesimal hypothesis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/planetesimal%20hypothesis. Accessed 30 Jun. 2022.
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The first known use of planetesimal hypothesis was in 1904
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