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Russian Meteor a Surprise—But Many More Out There

The spectacular meteor explosion above Russia‘s Ural Mountains this morning was caused by a likely truck-size rock weighing in at about nine tons. (Related pictures: “Meteorite Hits Russia.”) It hit the atmosphere at an estimated 31,000 miles (50,000 kilometers) per hour, and at that high velocity—many times the speed of sound—tremendous air pressure caused the…