An enormous 'megacomet' is more than 80 miles wide and has a staggering mass of 500 trillion tonnes, 's Hubble Space Telescope has revealed.
The comet, called C/2014 UN271 (Bernardinelli-Bernstein), was first discovered back in 2010, but its size has only been confirmed today.
Its nucleus – the solid centre of the comet – is about 50 times larger than the nucleus of most known comets, and is the largest that NASA has ever seen.
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