Alles, was man gerne von Borisov (weniger berühmt und weniger zigarrenförmig als der erste interstellare Eindringling, ʻOumuamua), wissen würde, u.a.: kommt er wirklich aus einem anderen Sonnensystem?

„[S]ix suggestions have been made as to how this might be something else. Four of them are quite definitely wrong. The other two would be really unlikely.
[…]
So this object almost certainly got sent to us long, long ago, from a star far, far away. (But as stated above, not from a galaxy far, far away.)“