Nasa scientists have said that the Chelyabinsk Meteor expended 500 killotons of energy, the power of 30 Hiroshima bombs whilst plummeting through the earths atmosphere. Its speed on entry to the earths atomsphere was calculated to be in the region of 44000 mph. At a distance of about fifteen miles above the earths surface the meteor exploded causing shockwaves that caused damaged to occur on the ground below.
The meteor which was estimated to have a mass of 10,000 tonnes blazed across the morning sky above Chelyabinsk before crash landing in lake Chebarkul which was frozen over at the time. In its wake it left over a thousand people injured and damaged to a large number of properties.