... 23.02.2013 . A meteoroid fell to Earth on February 15, streaking some 20 to 30 kilometers above the city of Chelyabinsk, Russia at 9:20am local time. Initially traveling at about 20 kilometers per second, its explosive deceleration after impact with the lower atmosphere created a flash brighter than the Sun. Curiosity Self Portrait Panorama . ... How would you change the course of an Earth-threatening asteroid? ... Mercury on the Horizon . ... Asteroid 2012 DA14 Passes the Earth . ...