(NBC NEWS) - An asteroid 150 feet wide will come closer to Earth than any other known asteroid of its size.
It'll pass 17,200 miles over our rooftops, 5,000 miles closer than satellites we use every day for television and other communications.
Astronomers first spotted the asteroid a year ago as a tiny dot in a star field. Since then, they've tracked it carefully and measured its exact size, leading them to this reassuring conclusion:
"It cannot hit Earth," said Don Yeomans, with NASA.
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