Usage History of 'blueshifts'

The following chart shows how frequently 'blueshifts' appeared in printed materials over time. For example, the word 'blueshifts' occurred 2 times in books in 1959 and 142 times in 2008. From 1959 to 2008, the word 'blueshifts' was used a total of 4,023 times in books scanned by Google. See Reference: Google Ngram project.

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