The Tunguska event was an aerial explosion that occurred near the Tunguska River in Siberia on June 30, 1908. The blast felled an estimated 60 million trees over 2,150 square kilometres. On this day, local residents observed a huge fireball, almost as bright as the Sun, moving across the sky. A few minutes later, there was a flash that lit up half of the sky, followed by a shock wave that knocked people off their feet and broke windows up to 400 miles away. So-called "alternativists," however, reject the meteor and comet theories, because of the lack of a major crater or fragments. Their search for more unlikely explanations has led to the site becoming a Mecca for UFO enthusiasts, spawning a Tunguska meteorite museum and scores of photographs of what are claimed to be parts of extraterrestrial craft discovered in the area. Who is right?
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