Usage History of 'planetesimal'

The following chart shows how frequently 'planetesimal' appeared in printed materials over time. For example, the word 'planetesimal' occurred 6 times in books in 1854 and 1,484 times in 2008. From 1854 to 2008, the word 'planetesimal' was used a total of 49,856 times in books scanned by Google. See Reference: Google Ngram project.

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