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Meteors (sometimes called Shooting Stars, Aerolites or Bolides) are very common. Millions enter the Earth's atmosphere daily. Friction, resulting from terrific speed at which they travel, makes them ignite and vaporize. Although most are completely burnt out, some ultimately explode, scattering debris far and wide. Some Meteors are of stone, others are metal - usually an alloy of iron and nickel with traces of other metals. Largest Meteorite ever found fell at Groetfontein in South West Africa; it weighs about fifty tons and consists of iron and nickel.
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