On June 30th, 1908, just after 7am, the sky above the Siberian outback was ripped apart. Trees were blown clean over and stripped to resemble telegraph poles, and people up to 40 miles away were thrown into the air by the force of the impact. The shockwave was felt as far away as England and the sky lit up with an eerie glow so bright that it was said that people in China could read their newspapers by it at night. What's even weirder, however, is that there was no impact crater. Of course, a giant, glowing thing whistling out of the sky sent the UFO enthusiasts into a frenzy. There are also those who think that the explosion was of nuclear origin, and some who just couldn't choose between the two and have gone with Nuclear Aliens. This, however, doesn't really go any way to explaining why there was no impact crater. Another, slight odd theory as to what happened is that the Earth collided with a rogue black hole or even a little pocket of antimatter. These, however, remain firmly in the realms of science fiction. Nope, it would seem that the Tunguska Event was a boring old meteor impact after all. It is estimated that a large space rock, about 120 feet across plunged towards the Earth at about 33,500 miles per hour. However, at about 28,000 feet (about the altitude of a commercial jet), the heat and pressure of entry caused it to explode with the force of over 180 Hiroshima bombs. Its altitude would have sent both the shockwaves and the glow of the explosion far and wide across the globe, and left little evidence of impact as most of the asteroid was destroyed in the blast. If you wan't some real mysteries, then check out these seemingly simple questions that still totally baffle scientists.