An asteroid twice the size of the Empire State Building will fly past the Earth tonight, according to , but it won't get close enough to cause any problems.The space rock, named 418135 (2008 AG33), will come about two million miles from the planet, which is roughly eight times further from the Earth than the moon.As it comes within Earth's orbit, and reaches its closest point, the asteroid will be travelling at 23,300 miles per hour, or about 30 times the speed of sound.
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