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Mysterious Record-Breaking Comet Has Now Grown a Tail

by Ryan Whitwam

Astronomers announced earlier this year that an enormous 62-mile (100-kilometer) object was creeping inward from the fringes of the solar system. We didn’t know what this mysterious visitor was at the time, but a recent development has shed light on the subject. The object, now officially designated C/2014 UN271, began forming a coma or tail in recent…

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