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How does an eclipse happen?

Hello Dr. Universe: I was wondering, how does an eclipse happen?

– Susan, 13, San Francisco, CA

 

Dear Susan,

It just so happens the Great American Eclipse is coming up on Aug. 21, 2017. This solar eclipse will be the only one visible from across the lower 48 states in nearly a hundred years. When it happens, parts of the country will experience darkness for a couple minutes during the day. » More …