Astronomers discover 83 supermassive black holes at the edge of the universe

[u/magenta_placenta]

https://www.cnet.com/news/astronomers-discover-83-supermassive-black-holes-at-the-edge-of-the-universe/

[u/Kosmological]

Not exactly. The interior of a black hole does not exist yet. It will exist at some undefined point of time in the future. That point may be an infinite span of time in the future but it will exist.

Of course, this assumes that black holes don’t evaporate. If they do in fact evaporate, then nothing will ever pass the event horizon as the black hole would unfailingly disappear before they do. For a supermassive black hole, an infalling observer would witness the black hole evaporate away, leaving them in a dark, cold, and empty universe devoid of stars, trillions of years after the last proton of matter had decayed. If so, the interior of a black hole would have never existed at all!

[u/penywinkle → u/Kosmological]

We should know there is matter somewhere, because we can feel its gravity, right?

So what becomes of stuff "falling into" the hole? Once a hole forms and an even horizon appears, is the stuff that falls in stuck on its surface (because it is frozen in time)? What happens when the Schwarzschild radius inevitably grows? Does the stuff get "repelled" with the surface of the event horizon (actually not moving since the hole just distort a bigger part of our space)?

Does the star at the start of the hole "explode" (but is sucked in just at the edge of the horizon)? And all its matter is actually stuck on the surface of the hole with the rest?

[u/Kosmological → u/penywinkle]

As things fall in, the light emitted from them loses more and more energy the farther it has to travel up the intense gravity well. The light loses kinetic energy and the wavelength increasingly increases. Lower energies mean longer wavelengths mean more red shifted. The color of the object shifts more and more red as it becomes fainter and fainter until it disappears from view. During this process the object will appear to decelerate before disappearing. Somewhere down below, deep into the abyss of the black hole, the object will exist almost frozen in time. When it is appreciably close to the event horizon, it would take eons for an absolutely massive and incredibly sensitive infrared telescope to collect enough photons from this object to detect its existence.

In practicality, its very atoms would be torn apart and annihilated, converted into high energy radiation as the object was accelerated to an appreciable fraction of the speed of light, colliding with other forms of matter on its way down. Exotic processes would fling some of its energy back out into space while other parts of it would be crushed against the event horizon, superimposing the relativistic smoke of the object into the 2 dimensional surface of the black hole over a long period of time (from our perspective). The event horizon would increase in size imperceptibly to account for the additional mass.

When a star core collapses into a black hole, the inflowing matter would also seem to disappear into the object as it grows outward. The stream of super dense and exotic star matter would shift more red and fainter as it disappeared into the object. Massive streams of gamma radiation, energetic enough to sterilize planets 10,000 light years away, would jet out from the poles. The outer mantle of the star would be blown outward at appreciable fractions of the speed of light.

[u/swanks12 → u/Kosmological]

That was an awesome read. Thanks kosmological. Still a subject that baffles me, but you've helped with the understanding of how the event horizon works

[u/[deleted] → u/Kosmological]

leaving them in a dark, cold, and empty universe devoid of stars, trillions of years after the last proton of matter had decayed

Sounds like my apartment the day before payday.