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Most meteors result from meteoroids no more than a few centimeters in diameter. A larger meteoroid which survives the fiery passage through the Earth's atmosphere as a meteor and strikes the Earth's surface is called a meteorite.
A meteoroid is a space rock floating in space. (If the space rock were large enough to see through a telescope from Earth, we would call it an "asteroid" instead.)

When a meteoroid (a space rock) hits the Earth's atmosphere at anywhere from 25,000 miles per hour to 150,000 MPH, the speed of the rock's passage through the atmosphere causes some friction, which generates heat, and a whole lot of compression, which generates even MORE heat. This heats the space rock to incandescence, meaning "glowing hot". The streak of light in the sky from the glowing-hot space rock is called a "meteor".

If the meteoroid was large enough, it may survive the passage through the atmosphere and impact the Earth. If the rock isn't entirely destroyed by the impact, then the surviving fragment is called a "meteorite".

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