... Last week, for example, our very Moon passed in front of the planet Jupiter. ... M51: The Whirlpool Galaxy in Dust and Stars . ... 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. ... Mercury on the Horizon . ... Asteroid 2012 DA14 Passes the Earth . ...