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Comet C/2022 E3 was first spotted last year. Its path will bring it within 26 million miles of the Earth on Wednesday, allowing it to be visible to the naked eye for perhaps the last time ever.
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The comet, known as C/2014 UN271 (Bernardinelli-Bernstein), has an estimated diameter of about 80 miles. That's bigger than Rhode Island and about 50 times larger than the heart of most comets.
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The comet was discovered less than a year ago near the orbit of Jupiter. Now, observers in North America can see it in the northeastern sky around sunrise.