A comet C/2014 UN271 (Bernardinelli-Bernstein) with a nucleus 50 times bigger than normal is barrelling towards Earth at 22,000 miles per hour.
Nasa's Hubble telescope has determined the comet's icy nucleus has a mass of about 500 trillion tonnes and is 85 miles (137km) wide - larger than the US state of Rhode Island.
But not to worry. The closest it will get is one billion miles away from the Sun, and that won't be until 2031.
It was first spotted in 2010 but only now has Hubble confirmed its existence.
And it's larger than any comet ever seen by astronomers before.
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Found Largest Comet Ever...
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