Happy Near Miss Day! In 1989 an asteroid roughly the size of a mountain came within 500,000 miles of colliding with Earth. Geophysicists estimate that the impact of that asteroid—had it actually collided with Earth—would have released energy equivalent to the explosion of a 600-megaton nuclear bomb. Astronomers didn’t discover the asteroid—or evidence of how close the near miss was—until nine days after the asteroid has passed.

from Forbes – Tech http://ift.tt/1UlwIu2
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