The monsterous 85-mile-wide comet C/2014 UN271 isn't just the largest icy rock in the Oort Cloud, it's the second most distant that is chemically active.

Astronomers discover the largest comet from the outskirts of the solar system is exploding with jets of gas

Source: space
Source Link: https://www.space.com/astronomy/solar-system/astronomers-discover-the-largest-comet-from-the-outskirts-of-the-solar-system-is-exploding-with-jets-of-gas