Shockwave from Russian meteor circled globe twice
BBC News: The shock wave from an asteroid that burned up over Russia in February was so powerful that it traveled twice around the globe, scientists say.
They used a system of sensors set up to detect evidence of nuclear tests and said it was the most powerful event ever recorded by the network.
More than 1,000 people were injured when a 17m, 10,000-tonne space rock burned up above Chelyabinsk.
The study appears in the journal Geophysical Research Letters.
Photo: Meteor over Russia (SPL)