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NASA's New Asteroid Sentry Stands Watch
By Robert Roy Britt
Senior Science Writer
posted: 11:30 am ET
14 March 2002
NASA announced this week a new Web-based asteroid monitoring system, called Sentry, to monitor and assess the threat of space rocks that could possibly strike the Earth.
http://www.space.com/scienceastronomy/solarsystem/asteroid_sentry_020314.html