A meteor’s contrail is seen over Chelyabinsk, Russia, on Feb. 15, 2013. The streaking meteor caused sharp explosions that injured hundreds of people, including many hurt by broken glass. (Chelyabinsk.ru / Associated Press)
Planetary scientists believe that the rock that smashed into Arizona around 49,000 years ago, causing this crater, hit with the power of more than 150 Hiroshima bombs. (AFP/Getty Images)
