Usage History of 'protogalaxies'

The following chart shows how frequently 'protogalaxies' appeared in printed materials over time. For example, the word 'protogalaxies' occurred 8 times in books in 1946 and 218 times in 2008. From 1946 to 2008, the word 'protogalaxies' was used a total of 8,223 times in books scanned by Google. See Reference: Google Ngram project.

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