NASA's Hubble Space Telescope has confirmed the largest comet nucleus ever seen, stating that the estimated diameter is approximately 80 miles across, making it larger than US' Rhode Island. The mass of comet C/2014 UN271 (Bernardinelli-Bernstein) is estimated to be 500 trillion tons. The previous record holder is comet C/2002 VQ94, with a nucleus estimated to be 60 miles across.