Footage from Russia shows the impact of a meteor blast on an office as it explodes in the Chelyabinsk region of the country.
According to the latest count, more than 750 people were hurt.
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.