'Blood moon' : Why is it red?

GAZA CITY, GAZA STRIP - MARCH 03: The earth's shadow passes over the moon for the first total lunar eclipse in three years March 3, 2007 over Gaza City, Gaza Strip. The next full lunar eclipse will occur on August 28, 2007.

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    'Blood moon' : Why is it red?

Astronomer Steve Finkelstein explains why the "blood moon" glows red.