Disney Canon
Star Wars: Heir to the Jedi
The problem with conspiracy theories is that they have their own gravity: they are black holes from which one rarely escapes
- Drusil (p. 176, digital)
Both statements are said in-universe by characters
Merely thinking that refilled the empty space in the Force with even more rage, and I saw what kind of space it was, a black hole that would always be hungry no matter how much I fed it.
- Luke (p. 256, digital)
Aftermath
The last thing Wedge wants to do is pilot around the edge of a black hole or through the center of a star going supernova
- strange narrator, digital edition
Battlefront: Twilight Company
He'd spoken of a singularity in the galactic Deep Core. In the middle of everything, Gadren said, there was a black hole that devoured all light and energy, exerting a gravitational pull more powerful than a thousand suns. p. 187 digital
No explicit references in Dark Disciple, A New Dawn, Lords of the Sith, or Tarkin