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Meteor explodes over Russia, injuring hundreds (+video)

A 10-ton meteor exploded over Russia on Friday, creating a shockwave that blew out windows and injured some 400 people. What you need to know about meteor strikes.

A 10-ton meteor exploded over Russia, shattering windows and injuring hundreds.
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A 10-ton meteor exploded in the sky above Russia on Friday, causing a shockwave that blew out windows injuring some 400 people and sending fragments falling to the ground in the Ural Mountains. Here's a look at those objects in the sky:

What's the difference between a meteor and a meteorite?

Meteors are pieces of space rock, usually from larger comets or asteroids, which enter the Earth's atmosphere. Many are burned up by the heat of the atmosphere, but those that survive and strike the Earth are called meteorites. They often hit the ground at tremendous speed — up to 30,000 kilometers an hour (18,642 mph) according to the European Space Agency. That releases a huge amount of force.

How common are meteorite strikes?

Experts say smaller strikes happen five to 10 times a year. Large impacts such as the one Friday in Russia are rarer but still occur about every five years, according to Addi Bischoff, a mineralogist at the University of Muenster in Germany. Most of these strikes happen in uninhabited areas where they don't cause injuries to humans.

What caused the damage in Russia?

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