556 asteroids size of washing machine hit Earth over past ...
556 asteroids size of washing machine hit Earth over past 20 years - NASA report 17 Nov, 2014 22:20 . ... our planet is bombarded with more than 100 tons of dust and sand-sized particles from space every day. ... The world's largest existing crater, which marks the biggest known cosmic intruder's hit, is the Vredefort crater in South Africa. ...