Are near-Earth objects a threat to Earth?
When did the last asteroid hit Earth?
The last asteroid of a considerable size impacted Earth's atmosphere was around 65 feet in diameter., which exploded about 20 miles above the city of Chelyabinsk in Russia on February 15, 2013. As the unnamed near-Earth asteroid fell, it was moving at over eleven miles per second. The explosion released the energy equivalent of around 440,000 tons of TNT. Even at that height, the shock wave and debris from the explosion damaged more than 7,000 buildings and produced 1,491 indirect injuries .
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