Using sensors designed to detect rogue nuclear tests, scientists have learned more about the meteor that exploded over Russia. It was much bigger than they first thought.
Initially, the Russian Academy of Science estimated the object's mass at about 10 metric tons (11 US tons). With more data in hand, researchers now say the object had a mass of 7,000 metric tons (7,700 US tons) and a diameter of about 50 feet.
The blast released energy comparable to a 300- to 500-kiloton nuclear warhead, says Bill Cooke, who heads the meteoroid environment office at NASA's Marshall Space Flight Center in Hunstville, Ala. By Comparison, the Nagasaki nuclear bomb had a yield of 20 to 22 kilotons.
Page 1 of 4