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Close Only Counts In Horseshoes

At about 2:30 p.m. EST on February 15th, 2013, a 50 meter (150 feet) diameter asteroid will approach within 28,000 km (17,000 miles) of the Earth, traveling at about 8 km/s (18,000 mph). Should you be worried? That depends on

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Target: Earth!

One of the best arguments, perhaps THE best, for a human presence in space is the certainty that there will someday be a civilization-killing asteroid or comet headed our way. It has happened in the past—just ask the dinosaurs—and it

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Asteroid 2010 TK7

Near-Earth Objects Near-Earth objects (NEOs) are of interest to us for several reasons. One is a matter of safety: if an asteroid or comet were to impact the Earth, the consequences could range from local damage to global catastrophe, depending

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