What in the world is a lunar eclipse tetrad?
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On April 15, 2014, an extraordinary series of total lunar eclipses will begin in the United States. This series, called a lunar eclipse tetrad, will result in four red moons over the course of a year and a half. NASA explains the significance behind this phenomenon, and sheds light on how the moon transforms into a bright red orb.
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- Video created by ScienceAtNASA
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