Blue Moon: Blue moon on Friday: How to watch online

On Friday, Aug. 31, skywatchers will be treated to a Blue Moon. Does this mean the Moon will actually look blue? Unfortunately, no. To understand the celestial event — and the story behind the name — we've prepared a briefAugust 31 is the second full moon in a calendar month, which earns it the epithet Blue Moon, the last time this will be seen until 2015.The saying "once in a blue moon" refers to something that's exceedingly rare. But you'll have two chances to see

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