[thunder-blue-3]

I've been following this news for the past couple of weeks-- in essence your statement is what they are hypothesizing, and that the "something at the center that unites the two poles" might be that we are within a black hole. https://en.wikipedia.org/wiki/Black_hole_cosmology for the curious.

[askonomm]

It was my understanding that if two black holes collide, they just form a bigger black hole, but we know there's a black hole in our universe, which then would mean that there's a black hole inside of a black hole that did not merge with the parent black hole, right? Is that something that is considered possible?

[lupusreal]

I'm under the impression that we really have no clue what's going on inside of black holes, so the most we can really say with confidence is that when two black holes collide they appear from the outside to now be a single black hole.

[blueflow]

The inner black hole did not come from the outside, it formed inside and if i had to guess, it is stuck in the inside together with all the other matter, unable to interact with the outside of the outer black hole.

[nashashmi]

“The universe is an orb and that orb is rotating causing all the other stuff to spiral.” This was a long held theory of mine because I could not understand why a galaxy would spiral.

I think there is a men in black scene, where an alien is rotating the universe globe like a toy they are playing.

[rdtsc]

> This was a long held theory of mine because I could not understand why a galaxy would spiral.

I think in general it would be unusual if they didn’t rotate. Any large non-uniform mass of gas or rocks when colliding will induce some rotation. What is odd though is that for galaxies we see more of them spinning one way than another.

[soulofmischief]

Ok but what is making the universe spin? This kind of theory is turtles all the way down.

[eightysixfour]

Doesn’t it have to spiral? Think of the gravity well, anything not orbiting is just falling. The only things not racing towards the black hole at the center of the galaxy are the ones that are orbiting.

[bencyoung]

From what I remembe of Undergrad physics this isn't actually possible. According to GR, within an event horizon, space-like pths become "time-like" which effecitvely means the singularity is unavoidably "in the future". No matter how big a black hole is, you can't just drift around inside it as literally all paths lead downward (hence even light not escaping)

If you were inside a black hole you wouldn't be able to see light from "deeper" because it wouldn't be able to travel towards you.

This is not what we see within the universe, so I don't think we can be inside a black hole

[kadoban]

All paths _eventually_ lead downward. Is there any limit to how long? Can't we just be near the outside of the blackhole and can't see the doom yet?