How Borisov found Borisov (the second interstellar object)

To start things off, a limerick: My dear old friend ‘Oumuamua I asked her — What’s up? What is new-ah? “I’ve been thinking of That guy Borisov The interstellar number Two-ah!” Figuring out what’s up with a new population of astronomical objects is like going to a party without knowing the dress code.  Here’s what’s … More How Borisov found Borisov (the second interstellar object)