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NASA's Hubble telescope has determined that a comet, which has a mass of around 500 trillion tonnes and is 137km wide, is heading our way at about 35.405 km per hour. However,
Hubble has confirmed the size of comet C/2014 UN271, first observed in 2010 by astronomers Pedro Bernardinelli and Gary Bernstein. Researchers Man-To Hui and David Jewitt developed a computer model to use Hubble imaging to confirm the size of the comet's nucleus as nearly 130 km (over 80 mi).
Comet C/2014 UN271, also known as Comet Bernardinelli-Bernstein or BB, is the biggest comet yet, as confirmed by new Hubble images.
Scientists using the Hubble Space Telescope have detected the largest known comet to date — it's about 50 times larger than usual.
The icy object is larger than the state of Rhode Island and weighs an estimated 500 trillion tons