Comet Leonard, the brightest and most anticipated comet for 2021, passed Earth, delighting viewers, but experts say something was off. Comets are believed to be leftovers of the solar system's creation, dating back billions of years ago. Comet Leonard, like all comets, is a massive rock of ice and organic matter. Eighty thousand years will have to go by before the comet makes another close approach on Earth.
Comets increase speeds from 26 miles per second to almost 300 miles per second as they
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