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The Largest Ice Comet Nucleus Ever Seen Has Been Confirmed Via NASA’s Hubble Space Telescope. The Comet, C/2014 UN271 (Bernardinelli-Bernstein), ~80 Miles In Diameter, Was First Observed In 2010 From An Observatory In Chile When It Was ~3 Billion Miles From The Sun. The Previous Record Holder, C/2002 VQ94, Discovered In 2002, Was ~60 Miles Across.