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Spaceguard

Plot of orbits of known potentially hazardous asteroids (size over 140 metres (460 ft) and passing within 7.6 million kilometres (4.7×10^6 mi) of Earth's orbit) as of early 2013 (alternative image).

The term Spaceguard loosely refers to a number of efforts to discover, catalogue, and study near-Earth objects (NEO), especially those that may impact Earth (potentially hazardous objects).

Asteroids are discovered by telescopes which repeatedly survey large areas of sky. Efforts which concentrate on discovering NEOs are considered part of the "Spaceguard Survey," regardless of which organization they are affiliated with.

A number of organizations have also raised related discussions and proposals on asteroid-impact avoidance.

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