HD - NASA's Jet Propulsion Laboratory artwork

NASA Planetary Defense: The Asteroid Hunters

HD - NASA's Jet Propulsion Laboratory

English - June 30, 2017 07:00 - 2 minutes - 21.9 MB Video - ★★★★★ - 83 ratings
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Two search projects,one in Arizona, the other in Hawaii,account for about 90% of all near-Earth object discoveries.