A rare total solar eclipse began in the Western state of Oregon Monday, as millions of people across the U.S. are watching the phenomenon from the Pacific to the Atlantic for the first time in 99 years.
Millions Across US Marvel at Total Solar Eclipse

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Children play on buried cars as people watch the solar eclipse at Carhenge in Alliance, Nebraska, Aug. 21, 2017.

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In this multiple exposure photograph, the phases of a partial solar eclipse are seen over the Gateway Arch in St. Louis, Missouri, Aug. 21, 2017. The Gateway Arch was just a few miles outside of the path of totality.

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Mike Newchurch, left, professor of atmospheric chemistry at the University of Alabama in Huntsville, and graduate student Paula Tucker prepare to launch a weather balloon to do research during the solar eclipse, on the Orchard Dale historical farm near Hopkinsville, Kentucky, Aug. 21, 2017.

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Benjamin Skroch from Evansville, Indiana, waits for the beginning of the solar eclipse at the James Bruce Convention Center in Hopkinsville, Kentucky, Aug. 21, 2017.