Nasa watched a boulder-sized object explode on March 17 2013 . Its flash was 10 times as bright as anything ever recorded on moon . Resulting crater in Mare Imbrium is 18.8 metres ( 61.7ft ) in diameter .
Nasa watched a boulder-sized object explode on March 17 2013 . Its flash was 10 times as bright as anything ever recorded on moon . Resulting crater in Mare Imbrium is 61.7ft ( 18.8 metres ) in diameter .