Supermoons are not uncommon, occurring on average three to four times a year. However, blue moons are less common, with only one in 33 supermoons meeting the criteria. Pictured is a super blue moon over London, England. (Photo: AP)
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Supermoons are not uncommon, occurring on average three to four times a year. However, blue moons are less common, with only one in 33 supermoons meeting the criteria. Pictured is a super blue moon over London, England. (Photo: AP)
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