New research shows interstellar visitor 21/Borisov is not your average comet

Two new separate studies published in Nature today have revealed that our second interstellar visitor, 21/Borisov, packs in three times as much CO than any other comet found wandering in the inner Solar System – a feature that gives astronomers a clue as to where it formed

Source: room.eu.com/news/new-research-shows-interstellar-visitor-21borisov-is-not-your-average-comet