A giant meteor shower bombarded Earth and the Moon 800 million years ago with more than 30 times the force of the asteroid strike that killed the dinosaurs, new research showed Tuesday. Japanese scientists examined images taken by the Kaguya lunar orbiter and found that an enormous asteroid — at least 100 kilometres (60 miles) in diameter — broke up and plunged into the Earth-Moon System, having a profound impact on life on our planet. The probability of an asteroid that size hitting Earth is roughly once in 100 million years, and impact craters of meteor strikes created before 600 million years ago have been erased by aeons of erosion and other geological processes.
— Read on news.yahoo.com/amphtml/massive-meteor-shower-hit-earth-moon-800-mn-150238003.html