Posted on 09/05/2015 2:41:01 PM PDT by LibWhacker
Heres an idea, what if the universe and everything we see around us is actually inside a black hole?
Whenever Im asked this question, what folks typically have in mind is that the universe began as an infinitely dense point, just like the singularity of a black hole, and because of cosmic expansion theres a limit to how far we can observe, so maybe thats like the event horizon. While its an interesting idea, things arent quite so simple.
To begin with, the universe did not begin with an explosion from a single point. It was definitely very hot and dense in its early period, but it didnt begin as a singularity. In fact there is debate whether black holes themselves have singularities. So while there are similarities between the two, we cant simply equate them.
The limit of what we observe (the size of the observable universe) also doesnt match up with the hypothetical event horizon of a cosmic black hole. For any mass you can calculate what is known as the Schwarzschild radius, which is the radius of a simple black hole of that mass. The mass of the observable universe is on the order of 1054 kg, which gives a Schwarzschild radius about 5 times larger than that of the observable universe.
So maybe were just in a really big black hole, and we just see a part of it. Not really. Just because you can calculate a Schwarzschild radius that doesnt mean an object is a black hole. Even if the Schwarzschild radius encloses all of your mass, it still isnt necessarily a black hole. On a basic level the density of the observable universe is pretty uniform. If you dont worry about cosmic expansion, then the radius of the observable universe increases at the speed of light with age, so the total mass of the observable increases with time. This is true in an expanding universe as well, but thats a different story. The thing is, the Schwarzschild radius increases linearly with mass, but the enclosed mass of the observable universe increases with the radius cubed. As the observable universe increases over time, then the Schwarzschild radius eventually grows faster than the radius of the observable universe.
For a true black hole you cant just calculate its size. You have to look at the overall structure. Our universe isnt collapsing in on itself, its expanding at an ever increasing rate. So it doesnt have the necessary structure to be the interior of a black hole. But there are some models that do propose that our universe was formed by the black hole of another universe. These models are very speculative, but generally propose that the super-dense interior of a black hole could create a baby universe that expands to become its own universe. Technically you could say this new universe is in the black hole that spawned it, but because of the bendable nature of space and time thats not particularly meaningful. The new universe would in no way be limited by the size of the black hole, and would exist on its own once it formed.
So its an interesting idea to speculate about, but there is no evidence to support the idea that our universe is in a black hole.
Yep, we entered it on Jan. 20th, 2009.
Yep! lol
So the Sun is the middle of the known universe!!/s
Shut up, little boy. Go back to the sandbox and play with your multi-coloured Legos./
Somewhere the Monads are getting restless.
Every college freshman develops this theory. Usually while listening to Pink Floyd.
Yes, and it is called “The Communist Wealth Re-Distribution Plan”.
Living in a country run by one
Thanks LibWhacker. I've said so before, mostly joking -- but it does best fit the purported facts when viewed through the conventional models.
A collection Super-Duper Giant Black Hole that spew universes in different time/space continuum?
Wow ...was that Déjà vu I just experienced?
Smells like it on burrito night.
Black hole?
More like a black hell.
when I get to heaven this will be one of the many questions I will have the answer too. Next will be who built the pryamids and why. then is Jimmy Hoffa really dead
Only if you are living in a feral-infested urban area.
Plus 1!
I do know that as I age...
...time begins to flow far more quickly...and accelerates. Time, like a river in its everlasting decent becomes a whitewater rage at its narrowest points. I feel I’m entering the neck of life’s hour glass. As it is now, a day goes by like an hour, a week seems like a day... a year like a couple of months, one warm...one cold. This “quickening” has made me very humble.... to prioritized those who are most important in my life... and to discard all those who waste my life.
God is great...Life is Good...and you are so Beautiful. :)
“then the radius of the observable universe increases at the speed of light with age”
I believe that would only be true if our universe is unbounded.
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