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Asteroids do not catch on fire, nor does the so-called "fire" occur in space. When an asteroid is in space it is simply a lump of rock of rock and/or metal. When an asteroid strikes the atmosphere of a planet, it does so at an incredibly high speed, in Earth's case at least 25,000 miles per hour and sometimes as fast as 100,000 miles per hour. At such speeds the air around and in front of the asteroid will become extremely hot and turn into glowing plasma, which looks somewhat like fire. It is not true fire as the materials that make up and asteroid are not flammable and no combustion is taking place.

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