Astronomers Gather To Watch European Space Agency's Rosetta Spacecraft Comet Landing At University Of Maryland [Getty Images]

COLLEGE PARK, MD - NOVEMBER 12: Astronomers watch broadcast from a control room of the European Space Agency that monitors the Rosetta mission as scientists are seen celebrating of a safe landing during a landing viewing party November 12, 2014 at University of Maryland in College Park, Maryland. The Rosetta has successfully landed on the comet after sailing through space for more than 10 years. (Photo by Alex Wong/Getty Images)

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