On Thursday afternoon, while you were fretting about how well President Joe Biden might perform in his debate with Donald Trump, a “planet-killer” asteroid roughly the size of Mount Everest passed within five million miles of Planet Earth. In cosmic terms, that’s really close—about 17 times the distance to the moon. Two days later, on June 29, a “city-killer” asteroid roughly the size of the Great Pyramid of Giza will pass within 180,000 miles of our planet. That’s actually closer than the moon.
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