NASA Associate Administrator for the Science Mission Directorate Thomas Zurbuchen speaks during a total solar eclipse briefing, Wednesday, June 21, 2017 at the Newseum in Washington. For the first time in 99 years, a total solar eclipse will occur across the entire continental United States on August 21. Coast to coast, from Oregon to South Carolina, 14 states will – over a span of almost two hours – experience more than two minutes of darkness in the middle of the day. Photo Credit: (NASA/Bill Ingalls)

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