50: Imposter Comet!

For only the second time, astronomers have spoptted an interstellar interloper wandering through our solar system. Comet 2I/Borisov was spoitted by amateur astronomer Gennadiy Borisov on 30 August 2019 — since then it has been imaged by Hubble and studied in enough detail to work out where it came from. (Well, maybe. These things are hard.) It's not easy to spot, but it's worth making friends with a local astronomer to get a glimpse, becuase Borisov won't be in our skies for long ...