There have been some emerging theories from cosmology to astrophysics about whether or not we are in a black hole. While there’s no evidence yet, there doesn’t seem to be anything that rules out the possibility.
Most recently I read an article that theorized the possibility of hyper black holes in Did a hyper-black hole spawn the Universe? which posited that:
In a paper posted last week on the arXiv preprint server, Afshordi and his colleagues turn their attention to a proposal made in 2000 by a team including Gia Dvali, a physicist now at the Ludwig Maximilians University in Munich, Germany. In that model, our three-dimensional (3D) Universe is a membrane, or brane, that floats through a ‘bulk universe’ that has four spatial dimensions. Ashfordi’s team realized that if the bulk universe contained its own four-dimensional (4D) stars, some of them could collapse, forming 4D black holes in the same way that massive stars in our Universe do.
So while there isn’t any smoking gun on this theory that makes it a sure thing due to technical complications and limitations to how far we can see into the cosmos, it does kind of make sense considering how nature tends to repeat itself. It could very well be that this Universe is existing within a hyper black hole that’s existing in a 4D universe. If you wanna do some further reading check out: Every Black Hole May Hold a Hidden Universe
I saw Contact :) one of my favorites cause it’s one of the few scifi movies that does the concept of wormholes some justice.
A huge amount of radiation is generated by the million degree accretion disk of trapped gas whirling around the 4 billion solar mass black hole at our galaxy’s heart.
Makoto Inoue of the Institute of Astronomy and Astrophysics in Taipei, and Hiromitsu Yokoo of Chiba University are proposing that advanced civilizations might pool their resources to construct a ring of “power stations” at the galaxy’s core. They would orbit the central black hole just beyond its solar system-sized accretion disk.
Some fraction of the radiation seething from the disk would be reflected and focused onto the power plants. Each power plant would transmit collected energy as a collimated microwave beam from a 100-mile diameter antenna.