A meteor over Chelyabinsk, Russia exploded on February 15, 2013, creating a shock wave that injured more than 1,500 people and caused widespread damage to buildings. The meteor was estimated to be about 20 meters (66 feet) in diameter and weigh about 10,000 tons. It entered the Earth's atmosphere at a speed of about 19 kilometers (12 miles) per second and exploded at an altitude of about 30 kilometers (19 miles).