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Consider this: you have a ruler made of plastic that is infinitely long.
So you hold out your ruler and it extends to infinity. What!?!
Instantly, we all know that is impossible. It's a physical thing. Only conceptually can something continue to go on forever.
Thus, the Universe, which is made up of the same basic elements that the ruler is made up of, cannot possibly be infinite.
So, the Universe has to be at least slightly less than infinite. But as soon as it is not infinite then you can reach the edge (end) and ponder what is on the other side.
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raddevus wrote: that is impossible
Would that also apply to singularities?
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
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jeron1 wrote: Would that also apply to singularities?
I'm going to provide an answer that no other scientist would give:
I don't know. 
However, I believe a singularity is simply the first-cause, right?
Just the point at which something begins. Again, I guess this has to be only conceptual because we have no way of testing to get back to the first-cause.
But, mostly, I don't know. 
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The universe isn't made out of stuff, it's filled with stuff. That's something completely different. An infinite universe doesn't have infinite rulers (or walkways or whatever) in it, there is no physical object extending forever.
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harold aptroot wrote: there is no physical object extending forever
I knew you'd end up agreeing with me.
EDIT
harold aptroot wrote: The universe isn't made out of stuff
Notice how deftly I ignored your main point?
That's because I would say, "well, what is it then? Not physical? What!?" and then the discussion would continue ad infinitum.
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The universe is, essentially, spacetime with fillings. It doesn't make much sense to ask what space and time are made out of. "Not physical" is not the description I'd use given that your alternative is metaphysics, but it's not like "one big physical object", more like "the space in which other things are" (plus the things, just to be all-inclusive).
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This has been very good discussion. Thanks for adding so much to the discussion. I have really enjoyed it.
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harold aptroot wrote: The rule is that measurable quantities cannot be infinite, but an infinite universe doesn't have a proper size
This is a very interesting point too, because it feels similar to "a system under observation changes".
As if the size of the Universe changes to finite when we find the end or measure it, but is conceptually infinite.
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The inability to form an infinite sidewalk from a finite amount of matter doesn't prove the universe to be finite.
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I know.
I was providing something for you to walk on.
The point is if you could travel faster than the speed of light toward the end of the Universe then at some point all energy would be exhausted (not from travel but from the limit naturally created by an end of energy and you'd be at the end of the Universe. A physical thing must have an end -- a physical thing without an end is only theoretical. That is why we call it physical and not metaphysical.
And I'm not saying that only in theory does the Universe end, I'm saying in fact it does because it is a physical object (we physical objects know this and study this and have our existence in a physical Universe). The instant you say the Universe is otherwise is the same instant it becomes non-physical and my final point then is that "all bets are off".
So, the Universe (as studied by Scientists,Philosophers and Mathematicians) is a physical beast and as such has a limit and so has an end.
Now you've heard the end of this discussion. Since, I've decided I am right. Yes, I'm kidding, but I do think what I've said makes sense.
The Universe, if physical -- and it is, must have a limit.
And if it isn't physical, then we aren't either.
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Let me see if I've understood your argument:
- We are physical;
- The universe is physical;
- We have a finite size;
- Therefore, the universe must have a finite size.
Is that an accurate summary?
Because if it is, I could replace "finite size" with "bumhole", and the argument starts to look rather silly.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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No.
I'm saying, The Universe is physical and mechanical, therefore finite.
I believe that most of your major scientists believe this too.
They speak of "almost" infinite but never infinite.
I don't believe anyone other than school children actually believe in any physical object that is infinite.
Infinite is just a concept, but not reality in the mechanical universe.
All physical (non-philosophical conceptual) things have limits. That's all my point is.
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That still leaves the question: if the universe has a finite boundary, what is beyond that boundary?
Or are you saying that spacetime is a localized concept that has no meaning "outside" of our universe? (Not that there would be an "outside" in that case. Or a "before".)
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Richard Deeming wrote: That still leaves the question: if the universe has a finite boundary, what is beyond that boundary?
This too is a point I was attempting to drive toward in a logical manner.
Though I freely admit my knowledge of any of this is very, very basic.
This was an idea too that at some point studying the physical mechanical universe becomes a study of metaphysical properties (when you reach the end of the physical).
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raddevus wrote: All physical (non-philosophical conceptual) things have limits
Prove it.
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raddevus wrote: The Universe, if physical -- and it is, must have a limit.
No.
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PIEBALDconsult wrote: No.
The best and most rational argument in the entire conversation so far.
To which I reply, with a most stunningly intelligent answer:
Yes, infinity +1! 
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The universe could be infinite...
Or it could just loop on itself like a circle.. or the surface of a doughnut....
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Super Lloyd wrote: or the surface of a doughnut....
So when we find the end of the universe the other side will be the counter of a bakery?
There are two kinds of people in the world: those who can extrapolate from incomplete data.
There are only 10 types of people in the world, those who understand binary and those who don't.
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Imagine you are an ant on the surface of the doughnut.... What do you find at the end of the doughnut? where is the end? what is the sound of one handed man clapping?
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Super Lloyd wrote: Imagine you are an ant on the surface of the doughnut.... What do you find at the end of the doughnut?
I see empty space above the doughnut. But perception does not change reality in this case.
There are two kinds of people in the world: those who can extrapolate from incomplete data.
There are only 10 types of people in the world, those who understand binary and those who don't.
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Out of curiosity.. didn't you understand my explanation? or are you trolling?
I am really confused whether I need to explain or not...
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Super Lloyd wrote: didn't you understand my explanation?
I guess not. You asked a bunch of questions so I don't see that as an explanation.
There are two kinds of people in the world: those who can extrapolate from incomplete data.
There are only 10 types of people in the world, those who understand binary and those who don't.
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If you are a one dimensional being living on a circle like universe. The circle has no end, yet it is finished.
If you are a 2 dimensional being living on a sphere or a doughnut like universe, your universe has no end yet it is finished.
There is a good chance we live on some kind of hypersphere...
The question here were to make you think. It failed apparently.
To be exact not a 3D space floating in a 4D universe.... a 3D universe of its own with such properties as a 3D sphere in 4D universe...
modified 17-Jun-17 8:45am.
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Super Lloyd wrote: It failed apparently.
Indeed.
There are two kinds of people in the world: those who can extrapolate from incomplete data.
There are only 10 types of people in the world, those who understand binary and those who don't.
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