"An Asteroid Closeup"

It looks like the folks in astronomy are getting a treat Tuesday night. An asteroid the size of "4 city blocks" is going to come closer to Earth than the moon!

Scientists say the asteroid won't hit us, but it will be barely more than 200,000 miles away when it passes Earth at 11:13 p.m. Tuesday, and in cosmic terms that's really close.

San Francisco Chronicle: Asteroid headed our way will miss by this much

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