In our universe there are supermassive black holes at the center of (most? all?) galaxies.
Is there such a black hole at the Galactic Core in the Star Wars universe? And if so what effect does it have on Coruscant and other core worlds? And if not, is there any explanation (in universe) about why? (Obviously the real explanation may just be that we didn't know about these black holes when the SW universe was invented, but that's not very interesting)
I will exceptaccept information from any level of canon, even fan fiction, I'm just curious if this has been leveraged in SW...