As nothing escapes the gravity of a black hole, not even light, and black holes feed on stars along with other cosmic bodies, theoretically, could this mean there will be a time when the universe becomes one enormous black hole?
...Theoretically....at some time,In the far and distant future, the Universe will be encompassed by a series of BLACK HOLE'S....After several million years,they will merge and become one large mass,that will remain in place,...the process then, after the Black Hole has regenerated itself, will then start all over again...Black Hole's are INFINITE in their capacity....They are, in theory, thought to be an everlasting source of a type of energy, that was formed Two hundred million years, before the gaseous eruption's started on Saturn's surface...........
I commented in the Ultimate Fate of the Universe about the 1998 New Scientist article about the Big Rip theory to explain the accelerating universe. If since the Big Bang the electron rest mass increases from nothing as the speed of light proportionally slows to prevent measurement of this directly from Earth, this explains red shift, plus the minimum rest mass for a star to fuse hydrogen to helium drops over time. Also the minimum rest mass for a star to become a black hole drops over time until a dead Sun becomes a black hole, then 22 billion years from now the Earth drops into the solar black hole, red shifting the whole sky to infinity as all matter in the Earth gets ripped to shreds.
The Big Bang for sound waves is the event horizon, as the 14.1 billion year half life of Th-232 precedes the Big Bang, where sound waves in an ether of neutrons could carry away the energy of a supernova. Heavy isotopes like Th-232 are naturally occuring nuclear molecules with He-6 in valence around a more tightly bound core. Valence He-6 could have two neutrons actually two dark matter protons with dark matter muons. Sound waves move whole atoms instead of electrons, so before the Big Bang, the muon rest mass would be increasing as the speed of sound proportionally reduces in speed.
If stars still form inside the Milky Way's central black hole the result may be of interest. The half life of U-238, 4.48 billion years, is approximately the age of the Sun. Pressure at the Sun's center converts U-238 to stable under pressure Th-238. A proton strips away He-6 in valence of Th-238 to create Li-7 by cold nuclear fusion at the center of the Sun. U-238 on the Earth's surface would originate from the center of the Sun by teleport. A star formed inside a black hole could radiate potential chemical energy without producing electromagnetic radiation, much like a stage magician making something on fire appear from his hand; so life on a nearby planet would use primarily chemosynthesis instead of photosynthesis to exist, looking like red tube worms and the like around a hydrothermal vent on Earth. U-238 swapped for Th-234 and He-4 by the center of the Sun, would also include chemical bonds for a planet that formed inside a large enough black hole.
What makes me think that Th-238 may be inside the Sun is that Cm-250 with a 9700 year half live, spontaneous fission 86%, would be stabler at the Sun's center instead of produced by hydrogen bomb explosion; and Cm-250 decays to C-12 + Th-238, instead of spontaneous fission at the center of the Sun. The amount of spontaneous fission isotopes inside the Sun, is how much carbon the Sun can produce currently from hydrogen or helium without first becoming a red giant star.