This one is a binary of a sun-like star and...a black hole. The distance is about that between Mars and the Sun. (The star is orbiting the black hole, which is obviously the more massive object).
Had they formed together, the black hole would have eaten the smaller star during its red giant phase.
So, now we have to work out how the heck this happened. Was there a third star that did get eaten? Did the black hole capture the other star?
So much fun for people who enjoy math.
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