Hubble Confirms Megacomet Bound for Inner Solar System Is Largest Ever Seen

Hubble Uncovers Bizarre, Evolutionary Missing Link From the Dawn of the Universe

NASA's Hubble Space Telescope spots largest comet ever seen by astronomers. It has an estimated diameter of 80 miles, which is larger than the state of Rhode Island.

Nasa scientists spy 'largest comet ever seen'. 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.