On Monday night, serious moon viewers may notice something different about the moon — if you look hard enough.
The full moon will be a blue supermoon, a celestial occurrence that combines two events: a super moon, which is when the moon is closest to the Earth; and a blue moon, the third of fourth full moons in a single season.
The cosmic event usually happens about once every 10 years, but there was a super blue moon last August as well. NASA determined that the moon had met the criteria for this seemingly rare event two years in a row.
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