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Some meteorites probably were in the cores of asteroids, once. A meteoroid is a space rock traveling through space, while a meteor is the brief streak of light caused when a space rock hits the Earth's atmosphere. Many meteors burn up completely or explode high in the atmosphere, while some survive to strike the Earth.

Where do the meteoroids come from? Some are probably leftovers from the formation of our solar system. Others may be rocks blasted into space from explosions caused by asteroid impacts on the Earth, or Venus, or Mars, long ago. At least one meteorite found on Earth has been identified as Martian in origin, and other meteorites may have been left over from the time 4 billion years ago when another planet collided with the proto-Earth and formed the Moon!

Asteroids do occasionally collide, breaking into smaller rocks, and it is likely that at least a few of those chunks eventually find themselves falling into the Earth's gravitational well.

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15y ago

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