On June 30, 1908, either a comet or a meteorite touched down in the Vanavara neighborhood of the Stony Tunguska River in Siberia, causing one of the greatest natural catastrophes in history. The explosion devastated an area of 1,500 square miles, blowing away millions of trees, two towns, and a whole host of reindeer. The shock was felt more than 600 miles away; even so, scientists did not get around to investigating until 1927.
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