"People watch a full moon known as a ""supermoon"" Sunday, August 10, at Ipanema Beach in Rio de Janeiro. <a href=""http://www.cnn.com/2014/08/10/world/gallery/supermoon-0810/index.html"">Supermoons</a> happen when the moon becomes full on the same day as its perigee -- the point in the moon's orbit when it's closest to Earth. Full moons occur near perigee approximately every 13 months, according to NASA."
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