A meteor that slammed into Russian airspace Friday is now believed to have been even more powerful than scientists originally thought.
New estimates obtained through a network used to detect nuclear blasts show the meteor had the energy equivalent of nearly 500 kilotons of TNT,
which is 30 times the power of the Hiroshima atomic bomb.
"We would expect an event of this magnitude to occur once every 100 years on average," Paul Chodas of NASA's Near-Earth Object Program Office said in a statement. -
NBC News