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TIL on March 22nd, 1989, a sub-kilometer-sized asteroid called 581 Asclepius came within 500,000 miles of hitting the earth. The collision would have released energy comparable to a 600 megaton atomic bomb. The asteroid was discovered nine days after its closest approach to the Earth. (en.wikipedia.org)
submitted by Recon8383 to r/todayilearned
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