Scientists find 'ghost particles' spewing from Milky Way | Virgin Galactic aces 1st-ever commercial space launch | Space quiz! The UN's Asteroid Day is named after which event that flattened about 800 square miles (2,070 square kilometers) of Siberian forest in 1908?
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Space quiz! The UN's Asteroid Day is named after which event that flattened about 800 square miles (2,070 square kilometers) of Siberian forest in 1908?