On march 23, 1989, a mountain-sized asteroid passed within 500,000 miles of Earth, a very close call according to NASA. Impact would have equaled the strength of 40,000 hydrogen bombs, created a crater the size of Washington D.C. and devastated everything for about 100 miles in all directions.
For comparison, 500,000 miles is approximately 800,000 kilometers. The moon is approximately 400,000 kilometers from the earth and is close enough to effect tides.
What is your most dramatic near miss?
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