Astronomers spot first activity on giant megacomet beyond Saturn


Spotting the first signs of activity on a record-setting comet of gargantuan size came down to a time-zone advantage.

Astronomers in New Zealand were the first to spot a coma, or zone of gas and dust, spreading around the megacomet C/2014 UN271, also known as Bernardinelli-Bernstein, which may be 1,000 times more massive than a typical comet. It could be the most massive comet ever found in all of recorded history.



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