Risk from 2029 asteroid now more remote: "The rogue rock, 2004 MN4, measures 320 metres (1,000 feet) across, making it big enough to wipe out a large city if it ever collided with Earth.
Last December, there were a few nail-biting days when NASA calculated, from early optical observations, that the asteroid had a more than one-in-50 chance of hitting Earth on April 13, 2029. "
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