An asteroid passing within 26,000 mi (42,000 km) of Earth, which is one tenth the distance to the Moon and not far above the orbital altitude of communications satellites, might seem like cause for concern. But when the 10 to 20 m wide asteroid 2012 TC4 did just that in the early hours of today, it provided the perfect opportunity to test a global asteroid-impact early-warning system...
Continue Reading Asteroid's close encounter puts global tracking network to the test

Category: Space




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