TruthSeeker said:
Well, yeah. So what's outside?
Meaningless question. (see below).
TruthSeeker said:
Well, that's an assumption, though...
No - it's by definition. We can know nothing BY DEFINITION. The Universe is ALL there is for us to experience.
If we manage to "exist" outside the universe as we currently understand it then the "universe" suddenly gets that much bigger for us - like opening the door to your small room and finding a larger city for us to exist in.
TruthSeeker said:
I don't get it. What's the difference between a "concept of the Universe" and "the properties of the Universe"? It sounds like you are saying "A is not equal to A".
Apologies for any confusion. Let me clarify....
We exist within our Universe - and as such "existence" is a concept within our Universe. We can say nothing about that which is not within our Universe. It is meaningless to do so.
All our concepts ("existence", "inside", "outside" etc) are thus only valid for objects within our Universe.
A "property of the Universe" is something that can be ascribed to the Universe. We can only apply concepts of this Universe to that which exists within our Universe - not to that which does not - as we can have no concepts about that which does not exist within.
"Outside" our Universe is a property of the universe that is, by definition, not within the universe and is thus meaningless.
TruthSeeker said:
Well, at this point in time, yes. But if there is an outside, then that already implies that there is an outside, since you cannot have a boundary without having two different "substances", which the boundary separates. It would be like saying there's a boundary in the middle of the ocean, when all that there is is ocean.
Just because it's outside our sphere of experience, that doesn't mean that it doesn't exist or is not logical. The Universe is all that we know of. But that doesn't mean that there's something which we don't know. We cannot make such assumption...
If the Universe has a physical boundary (i.e. a wall) that we can not ever cross such that we can not experience what is "outside" - then there is nothing meaningful outside that boundary - and we have defined our Universe.
The Universe may have an "outside" but we can not say. We can know nothing about what is not inside. In this instance the Universe is defined by the physical boundary (i.e. everything within the boundary).
But the boundary can also be one of "existence".
i.e. with the physical boundary we can not exist beyond the wall - but if the wall was not actually there,
but existence still reached no further, then the universe is still defined by what exists.
Thus there really is no difference between a Universe that is bound by a wall and one that is bound by existence.
i.e. we define the Universe as all that exists.
As for polyverses, multiverses etc - remember, we can only define OUR universe. When we say "the Universe is all that exists" we can only apply our concept of "existence" as it is in our Universe.
We can say nothing meaningful about other universes.
We can theorise, we can speculate - but ultimately, unless it "exists" in our universe we can say nothing meaningful about it.
So I suppose I would amend the thread and say "The Universe is all that
meaningfully exists." and by
meaningful I mean that which is not meaningless.
I think