Făkünamę wrote:So if you could travel faster than the universe is expanding holding the same course the entire time would you eventually return to where you started?
Universe is not expanding, Space/time is expanding in our local part of Universe. One word. There is no outside, at best there are boundaries between causal dimensions, but even if outside spacetime there is an infinite void it is still all Universe.
That which does not exist in Universe does not exist.
"What started as a legitimate effort by the townspeople of Salem to identify, capture and kill those who did Satan's bidding quickly deteriorated into a witch hunt" Army Man
Substitute Space/time for 'universe' if it makes you happy. The analogy used is often a balloon being inflated giving the impression that traveling in a 'straight' line in curvature of space/time would eventually return you to your starting point - like circumnavigating the Earth - provided you could travel fast enough. So is that possible?
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The universe contains nothing which is outside of the universe.
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Deep Sea Isopod wrote:OK, so everything that exists is made of matter and/or energy.
All matter and energy exists in the universe, as the universe consists of everything that exists.
So outside of the universe cannot exist, because there is no matter or energy. And if something isn't made of matter or energy it cannot exist.
(And as a side note if a religious person says god exists outside of the universe they have just described them out of existence )
Even a point in space and time exists. So outside of space and time does not exist.
Does this make sense to anyone? I'm probably completely wrong, but I'm just trying to make sense of what's outside of the universe.
The "universe", by definition, is everything in existence. There is no "outside the universe". It's an oxymoron.
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Făkünamę wrote:Substitute Space/time for 'universe' if it makes you happy. The analogy used is often a balloon being inflated giving the impression that traveling in a 'straight' line in curvature of space/time would eventually return you to your starting point - like circumnavigating the Earth - provided you could travel fast enough. So is that possible?
I recall seeing perhaps Horizon or something that was talking about it being less like a balloon and more like a bowl or an indentation, much like they say the mass of A sun affects the gravitational field, that spacetime is itself just a massive dip in a gravitational field. I've heard various things like it needs to be stationary, not rotating, that it depends on all manner of things. I'd say its possibly possible.
Actually... found a great pic.
Last edited by Audley Strange on Wed Mar 13, 2013 1:27 am, edited 2 times in total.
"What started as a legitimate effort by the townspeople of Salem to identify, capture and kill those who did Satan's bidding quickly deteriorated into a witch hunt" Army Man
Seth wrote:
What about the everything that does NOT exist in the universe?
I've highlighted the key words for you.
And WHICH universe are you talking about?
There's a clue in the word. I've highlighted that for you, too.
If you want to use that argument, then you are Catholic. "Catholic" means "universal".
The word "universe" was also used when we thought that our galaxy was all that existed. There was, by definition, nothing outside of our galaxy because it WAS the universe.
As our knowledge changes, so do the definitions of words.
P1: I am a nobody.
P2: Nobody is perfect.
C: Therefore, I am perfect
Făkünamę wrote:Substitute Space/time for 'universe' if it makes you happy. The analogy used is often a balloon being inflated giving the impression that traveling in a 'straight' line in curvature of space/time would eventually return you to your starting point - like circumnavigating the Earth - provided you could travel fast enough. So is that possible?
I think so. I've certainly heard something along those lines before - though as I understood it, it was purely theoretical anyway. But as the universe has now expanded such that we cannot see the entire universe, and as the increasing expansion actually reduces our horizon, that 'straight line' never reaches it's destination. Sort of like if you move 25% of the remaining distance towards your goal each step, you never actually arrive.
[Disclaimer - if this is comes across like I think I know what I'm talking about, I want to make it clear that I don't. I'm just trying to get my thoughts down]
That just means that we need to start considering unique causal dimensions as component parts of Universe.
"What started as a legitimate effort by the townspeople of Salem to identify, capture and kill those who did Satan's bidding quickly deteriorated into a witch hunt" Army Man
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