Asteroid - closest to earth in recorded history

More details here:
http://youtu.be/rtesZxRlqOE
aaronfrsays...

While there is a very low probability of impact this time (1 in a million), my understanding is that if it passes through the gravitational keyhole, the probability of it swinging back around and hitting us in 20 or so years is more like 1 in 1000.

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