On Oct. 12, 2017, the asteroid 2012 TC4 is slated to whizz...

On Oct. 12, 2017, the asteroid 2012 TC4 is slated to whizz by Earth – dangerously close.

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The exact distance of its closest approach is uncertain at this time, as well as its size. Based on observations in October 2012 when the space rock missed our planet, astronomers estimate that its size could vary from 12 to 40 meters. The meteor that exploded over the Russian city of Chelyabinsk in February 2013, injuring 1,500 people and damaging over 7,000 buildings, was about 20 meters wide. Thus, the impact of 2012 TC4 could be even more devastating.

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