Usage History of 'photospheres'

The following chart shows how frequently 'photospheres' appeared in printed materials over time. For example, the word 'photospheres' occurred 6 times in books in 1830 and 369 times in 2008. From 1830 to 2008, the word 'photospheres' was used a total of 11,458 times in books scanned by Google. See Reference: Google Ngram project.

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