Is our universe really a giant black hole?

Question

I have read that the larger a black hole becomes, the less the average density needs to be to "still be a black hole". The last articles I read on this were written in the 80s.

Answer 1

It is possible.

There is no proof of what is actually inside of a black hole. Since time and dimensions change in a black hole, it is possible that all black holes are separate universes and may actually contain other black holes.

This would fit in with the big bang theory.

The bang occurred when the event horizon was formed, time reversed beyond the event horizon, and the black hole started expanding as it gained mass, instead of contracting into a much theorized singularity.

In order for our universe to be a "black hole", it's total mass would have to be about 2.5 times what current estimates for it's mass are, assuming the current known size of the universe.

Almost like the old worlds within worlds theory.

Answer 2

What is a black hole? It is a region of space where nothing can escape from. Given that the universe expansion is such that everything has to remain inside, that part of the analogy is respected.

What goes on inside a black hole? As soon as an object falls in, it is accelerated to relativistic velocities, but never reaches the center as the space inside is stretched to infinity. For something inside the black hole, it would appear as if everything would be expanding. So, again, to a certain degree, the analyogy black hole to universe still holds.

However, there is something that makes the universe behave differently: the dark energy. This causes the rate of universal expansion to increase over time. Is there a parallel with a black hole? How about Hawking radiation?

In the end, all I can say is that there are analogies between a black hole and the universe. Is the universe a black hole then? How could we find out?

But this is still a pretty good analogy.

Answer 3

We don't really know...do we? But I agree with Vincent, there are a lot of similarities between what we can observe in our known universe and what we guess the interior of a black hole might be like. Check out the source for a 2003 article on the universe as a black hole.

Answer 4

that goes against so much about our universe and black holes I can't count the ways.But here's a couple 1. black holes are collapsed dead stars, how can a universe be within a collapsed dead star 2. Black holes crunch matter to the point where their is no space whatsoever within the matter (maybe not even on the molecular level)

Answer 5

No, although you are correct about the density of a black hole (assuming density means mass over the volume of the event horizon). For super-massive black holes at the centre of SOME galaxies, the density can be less that that of water (although the singularity at the centre is still infinitely dense).

Answer 6

No it is not really a black hole. The Universe is defined as the summation of all particles and energy that exist and the space-time in which all events occur. Based on observations of the portion of the universe that is observable, physicists attempt to describe the whole of space-time, including all matter and energy and events which occur, as a single system corresponding to a mathematical model.

Answer 7

There is a black hole in the middle of each galaxy . It forms the gravity well that keeps all the solar systems in orbit. It may be 100 light years across.

Answer 8

No, because blackholes have singularities at their centers, and the universe is obviously not a singularity.

Answer 9

No, but they believe there's one at the center of every galaxy!

Answer 10

nope, if you been payin attention to astromnmy you would know there are severval known black holes