First identified comet to visit our solar system from another star: Interstellar comet 2I — Borisov swings past sun

by Translucidmind | Dec 26, 2019 | Physics

https://www.sciencedaily.com/releases/2019/12/191212142716.htm

https://www.sciencedaily.com/releases/2019/12/191212142716.htm