The question (Astronomy Cast, MP3, February 16, 2008, Curtis High School around 8:00 in) from "Rocks" is whether white holes really exist. It is recapitulated by Fraser: "All right. I've heard white holes theorized. Are they really out there?" and Pamela's answer given is: "No." and later: "These things can't actually exist in today's universe."

I didn't hear about white holes orbiting black holes -- only contrasted with, as Pamela's way of describing them.

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