공룡을 멸종시킨것은 소행성이 아닌 혜성
2013-03-25 20:01 Dinosaur-killing space rock 'was a comet' The space rock that hit Earth 65 million years ago and is widely implicated in the end of the dinosaurs was probably a speeding comet, U.S. scientists say, BBC reported Mar.22. Researchers in New Hampshire suggest the 180km-wide Chicxulub crater in Mexico was carved out by a smaller object than previously thought. Many..