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In this photo distributed by the Urals Federal University Press Service a researcher examines pieces of a meteorite in a laboratory in Yekaterinburg on Monday, Feb.18, 2013. Researchers from the Urals Federal University, based in Yekaterinburg, have determined that the small stone-like pieces found near Lake Cherbarkul in the Chelyabinsk region are pieces of the meteorite that exploded over the region Feb. 15. A total of 53 pieces have been brought for analysis to the university in Yekaterinburg. The largest one is one centimeter in diameter, the smallest is about one millimeter. (AP Photo/ The Urals Federal University Press Service) In this photo distributed by the Urals Federal University Press Service a researcher examines pieces of a meteorite in a laboratory in Yekaterinburg on Monday, Feb.18, 2013. Researchers from the Urals Federal University, based in Yekaterinburg, have determined that the small stone-like pieces found near Lake Cherbarkul in the Chelyabinsk region are pieces of the meteorite that exploded over the region Feb. 15. A total of 53 pieces have been brought for analysis to the university in Yekaterinburg. The largest one is one centimeter in diameter, the smallest is about one millimeter. (AP Photo/ The Urals Federal University Press Service)  

Scientists claim discovery of Russian meteorites

The giant space rock streaked spectacularly over the central city of Chelyabinsk on Friday before exploding with the force of 30 of the nuclear bombs dropped on the Japanese city of Hiroshima during World War II.

There was initial disappointment when Russian emergency ministry workers who scoured a lake where at least some of the fragments were believed to have fallen were unable to find anything in their initial search over the weekend.

But members of the Russian Academy of Sciences who conducted chemical tests on some unusual rock formations they found on Sunday said the pieces had come from outer space.

Full story: Scientists claim discovery of Russian meteorites