planetesimal hypothesis
noun
: a hypothesis in astronomy: the planets have evolved by aggregation from planetesimals
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So far, the planetesimal hypothesis seems to be the only explanation that fits the spectra seen.
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John Wenz, Popular Mechanics, 4 Apr. 2019
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John Wenz, Popular Mechanics, 4 Apr. 2019
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“Planetesimal hypothesis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/planetesimal%20hypothesis. Accessed 22 Jul. 2025.
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