A similar-sized meteor to the one that exploded in the sky over Russia would cause "significant fatalities" if it hit Earth.
But the 10-ton meteor was "very small" comparatively and objects of that size rarely penetrate the Earth's atmosphere, according to Hugh Lewis of the University of Southampton.
Experts said the meteor appeared to be unconnected to an asteroid predicted to narrowly miss the Earth tonight.
The asteroid, named 2012 DA14, is big enough to flatten London and could come as close as 17,200 miles.
Where did it come from? What was it made of? What can be done if we know a meteor or asteroid is going to hit Earth?
A look at some of the best video from the Russian Meteor. More than 400 people were injured after it flew over a Russian city.