Total Solar Eclipse seen over the U.S. on August 21, 2017
August 21, 2017

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People watch the solar eclipse from the observation deck of The Empire State Building in New York City, August 21, 2017.

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Mike Newchurch, left, professor of atmospheric chemistry at the University of Alabama in Huntsville, and graduate student Paula Tucker prepare a weather balloon before releasing it to perform research during the solar eclipse, Aug. 21, 2017, on the Orchar

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The Isle of Palms beach turns dark during the solar eclipse Monday, Aug. 21, 2017, on the beach at Isle of Palms, South Carolina.

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This composite image of nine pictures shows the progression of a partial solar eclipse near Banner, Wyoming, Aug. 21, 2017.