Watch: Striking details about 'largest comet ever seen' that

NASA's Hubble Space Telescope confirmed the largest icy comet nucleus ever seen by astronomers, with a mass of 500 trillion tonnes. It is said to be a hundred thousand times greater than the mass of a typical "comet found much closer to the Sun". 

NASA revealed that the estimated diameter of the comet is appeared to be 80 miles across, which means it is larger than the US state of Rhode Island. 

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