Past and future encounters with near-Earth objects highlight the need to keep track of potential threats — and send astronauts to asteroids if necessary. By Jay Barbree, NBC News’ Cape Canaveral correspondent.
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Mon, 10/26/2009 - 7:43am
Past and future encounters with near-Earth objects highlight the need to keep track of potential threats — and send astronauts to asteroids if necessary. By Jay Barbree, NBC News’ Cape Canaveral correspondent.