An asteroid, somewhere between 50-120 meters in length, passed within 120,000 kms of the Earth. This is closer than half the distance to the Moon. By comparison, it is like a tiny pebble passing by a basketball about 12 feet away. However, the asteroid's impact would have been devastating had it struck, similar to the Tunguska blast in Siberia which had a destruction radius of 20 kilometers and an explosion over 1000 times as great as the bombs over Hiroshima and Nagasaki. But here is the best part: astronomers discovered the asteroid only after it passed the Earth. Three days later, in fact.
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