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The beginning of a total lunar eclipse is seen from the Qizhong Tennis Court in Shanghai October 8, 2014. The eclipse is also known as a “blood moon” due to the coppery, reddish color the moon takes as it passes into Earth's shadow. The total eclipse is the second of four over a two-year period that began April 15 and concludes on Sept. 28, 2015. The so-called tetrad is unusual because the full eclipses are visible in all or parts of the United States, according to retired NASA astrophysicist Fred Espenak. (Photo by Aly Song/Reuters)
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