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Hubble telescope measures biggest comet ever seen

Hubble telescope measures biggest comet ever seen

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The Hubble space telescope has measured the biggest comet ever seen — a 500 trillion-tonne behemoth hurtling at 22,000mph from the far reaches of the solar system.

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The Bernardinelli-Bernstein comet — also known as C/2014 UN271 — was first spotted in 2010,

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when it was three billion miles from the Sun and too distant for its size to be assessed.

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Twelve years later, Hubble’s images have helped astronomers to size up its icy nucleus.

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“We’ve always suspected this comet had to be big because it is so bright at such a large distance.

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Now we confirm it is,” said David Jewitt, professor of planetary science and astronomy at the University of California.

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