Analysing tiny "spherules" embedded in layers of rock, a team from the Purdue University in the US said they found the "first real solid evidence" of asteroid bombardment.
The spherules were created when asteroids crashed into the Earth, vaporizing rock that expanded into space as a giant vapour plume.
Day in Pics: 29th March
Showbiz World - March 29, 2015
'Bharat Ratna' Atal Bihari Vajpayee