Exploding meteor over Russia

FILE In this 1953 file photo, trees lie strewn across the Siberian countryside 45 years after a meteorite struck the Earth near Tunguska, Russia. The 1908 explosion is generally estimated to have been about 10 megatons it leveled some 80 million trees for miles near the impact site. The meteor that streaked across the Russian sky Friday, Feb. 15, 2013, is estimated to be about 10 tons. It exploded with the power of an atomic bomb over the Ural Mountains, about 5,000 kilometers (3,000 miles) west of Tunguska. (AP Photo, File)

A circular hole in the ice of Chebarkul Lake where a meteor reportedly struck the lake near Chelyabinsk, about 1500 kilometers (930 miles) east of Moscow, Russia, Friday, Feb. 15, 2013. A meteor streaked across the sky and exploded over Russia's Ural Mountains with the power of an atomic bomb Friday, its sonic blasts shattering countless windows and injuring nearly 1,000 people. (AP Photo)

A circular hole in the ice of Chebarkul Lake where a meteor reportedly struck the lake near Chelyabinsk, about 1500 kilometers (930 miles) east of Moscow, Russia, Friday, Feb. 15, 2013. A meteor streaked across the sky and exploded over Russia's Ural Mountains with the power of an atomic bomb Friday, its sonic blasts shattering countless windows and injuring nearly 1,000 people. (AP Photo)

In this combo made from frame grabs from dashboard camera video, a meteor streaks through the sky over Chelyabinsk, about 1500 kilometers (930 miles) east of Moscow, Friday, Feb. 15, 2013. With a blinding flash and a booming shock wave, the meteor blazed across the western Siberian sky Friday and exploded with the force of 20 atomic bombs, injuring more than 1,000 people as it blasted out windows and spread panic in a city of 1 million. (AP Photo/AP Video)

In this frame grab made from dashboard camera video, a meteor streaks through the sky over Chelyabinsk, about 1500 kilometers (930 miles) east of Moscow, Friday, Feb. 15, 2013. With a blinding flash and a booming shock wave, the meteor blazed across the western Siberian sky Friday and exploded with the force of 20 atomic bombs, injuring more than 1,000 people as it blasted out windows and spread panic in a city of 1 million. (AP Photo/AP Video)

In this frame grab made from dashboard camera video, a meteor streaks through the sky over Chelyabinsk, about 1500 kilometers (930 miles) east of Moscow, Friday, Feb. 15, 2013. With a blinding flash and a booming shock wave, the meteor blazed across the western Siberian sky Friday and exploded with the force of 20 atomic bombs, injuring more than 1,000 people as it blasted out windows and spread panic in a city of 1 million. (AP Photo/AP Video)

In this frame grab made from dashboard camera video, a meteor streaks through the sky over Chelyabinsk, about 1500 kilometers (930 miles) east of Moscow, Friday, Feb. 15, 2013. With a blinding flash and a booming shock wave, the meteor blazed across the western Siberian sky Friday and exploded with the force of 20 atomic bombs, injuring more than 1,000 people as it blasted out windows and spread panic in a city of 1 million. (AP Photo/AP Video)

In this frame grab made from dashboard camera video, a meteor, upper left, streaks through the sky over Chelyabinsk, about 1500 kilometers (930 miles) east of Moscow, Friday, Feb. 15, 2013. With a blinding flash and a booming shock wave, the meteor blazed across the western Siberian sky Friday and exploded with the force of 20 atomic bombs, injuring more than 1,000 people as it blasted out windows and spread panic in a city of 1 million. (AP Photo/AP Video)

In this frame grab made from dashboard camera video, a meteor streaks through the sky over Chelyabinsk, about 1500 kilometers (930 miles) east of Moscow, Friday, Feb. 15, 2013. With a blinding flash and a booming shock wave, the meteor blazed across the western Siberian sky Friday and exploded with the force of 20 atomic bombs, injuring more than 1,000 people as it blasted out windows and spread panic in a city of 1 million. (AP Photo/AP Video)

In this frame grab made from dashboard camera video, a meteor, upper left, streaks through the sky over Chelyabinsk, about 1500 kilometers (930 miles) east of Moscow, Friday, Feb. 15, 2013. With a blinding flash and a booming shock wave, the meteor blazed across the western Siberian sky Friday and exploded with the force of 20 atomic bombs, injuring more than 1,000 people as it blasted out windows and spread panic in a city of 1 million. (AP Photo/AP Video)