We asked astrophysicist Neil deGrasse Tyson how often a 'blue moon' actually occurspic.twitter.com/2pqfWJ31Bj
Neil deGrasse Tyson explains what 'once in a blue moon' really means
Looking into the literal and colloquial meanings of the phrase with Neil deGrasse Tyson.
2:13 PM - 6 Dec 2017
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