Most asteroids are the rubble left over from the formation of the solar system about 4.6 billion years ago. They're usually too far away from Earth to pose a threat to people. But because no one wants to repeat the dinosaurs' misfortune, keeping an eye on the ancient rocks and comets zooming through space is paramount.
This part, surprisingly, actually has a decent HOWTO about it written by Google, so I will just link it here:
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