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Re: This is not closed yet
[Re: Superku]
#334944
07/25/10 22:33
07/25/10 22:33
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Joined: May 2007
Posts: 2,043 Germany
Lukas
Programmer
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Programmer
Joined: May 2007
Posts: 2,043
Germany
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No, we know the room is curved by mass, and that causes gravity. We know that although we can't look from the "outside in the 4th dimension" or something. One of the effects of a curved space is that the angles of a triangle don't add up to 180° (like if you take a triangle from the North pole, to the euqator, to an other point on the quator, 90 degrees of longitude away, and back to the north pole. That's 3*90°=270°>180°.). In that Youtube video that physicist said that this can be measured by observing some stars, and the sum of the angles is 180°, which means space is flat on larger scales. This means, the universe is either infinite, or must have some "end" somewhere and the latter case sounds pretty unlikely.
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Re: This is not closed yet
[Re: Superku]
#334956
07/25/10 23:16
07/25/10 23:16
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Joined: May 2007
Posts: 2,043 Germany
Lukas
Programmer
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Programmer
Joined: May 2007
Posts: 2,043
Germany
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"Where's the context?" The context is that the universe could be finite but endless if it was curved, like a "4D-Sphere" (or 5D if time is also curved that way). But if it's flat, it's rather infinite. That's why I started talking about curved space.
If you walk on the triangle I told you about in my last post, you would also "just walk on the projection" and still measure 270°. Same for the universe. Trust me, we can measure that space is curved, or Einstein would have never found that out in the first place.
Expansion has nothing to do with an infinite or finit universe.
@PHeMoX: "Why would an end be so unlikely? I think it's more a 50/50 kind of thing actually." That would prompt many questions, like how do things behave near the end. What if you try to go beyond that end? Should there be an undestructable end? That somehow sounds... unlikely. But maybe possible.
"I think infiniteness here is a somewhat semantical thing. Does 'ever expanding' mean 'infinite' also? Or does it have to be 'without boundaries'? What if it has a boundary that's expanding too fast to ever catch up with? I'd say that would qualify as 'infinite' from our perspective as well." I guess that would be no real infinity, although we couldn't distinguish it. But we can't look further than 14 billion lightyears anyway, if there is some boundary behind it, we would never find out.
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Re: This is not closed yet
[Re: checkbutton]
#335000
07/26/10 09:52
07/26/10 09:52
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Joined: Apr 2008
Posts: 650
Sajeth
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User
Joined: Apr 2008
Posts: 650
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Guys... Fighting on the internet is like running the special olympics: Even if you win, you're still retarded! I love you, lets make out sometime.
Teleschrott-Fan.
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