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Why the World Didn't End Yesterday Worried the end of the world is coming on Friday? A new video from NASA will calm your fears, citing "the whole thing is a misconception from the very beginning." According to news reports circulating for years, an ancient Mayan prophecy named Friday, Dec. 21 2012 as the day the world would come to an end. The NASA video says one cycle of the Mayan ends on this day, but that doesn't mean the Earth will cease to exist.