Meteorites are made of rock or metal. They enter the Earth's atmosphere at speeds of at least 11 km per second., which makes them glow brightly. Several thousand meteorites enter the Earth's atmosphere every years, but very few of them reach the ground. The largest known meteorite is made of iron and weighs 66 tonnes. It probably feel to the Earth in prehistoric times in what is now Namibia, southwest Africa.
In general, it is difficult to find meteorites. Recently, researchers have been locating them on the ice sheets in the Arctic and the Antarctic, where they are easier to find.
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