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The little asteroid 2012 KA passes near Earth today before heading back out into space. Credit: JPL

Heads up: NASA says 4,700 potentially hazardous asteroids are out there

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This afternoon around 3 o'clock Central time, asteroid 2012 KA will fly silently past Earth at a distance of about 139,433 miles. That's a little more than halfway to the moon and well out of harm's way. 2012 KA was discovered only yesterday by the Mt. Lemmon Observatory as part of the larger Catalina Sky Survey. The survey's goal is to find and determine orbits of larger, potentially hazardous near-Earth asteroids (PHAs) from 100 meters (330 feet) on up.

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