A Cosmic Close Call
A large asteroid passed uncomfortably close to the Earth this week. If it struck us, it would have done so with the force of a very large nuclear weapon. If you were in the right place at the right time, you might have been able to spot it with a pair of binoculars as a speck of light slowly drifting across the sky. To really get a sense of how close it was, check out this video showing its trajectory.
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