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Re: Where is the center of the universe?

Cross-posted to 3 groups.

Followups directed to: sci.physics.relativity

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dvus wrote:
^^^^
Please fix.

> It seems as though no one can say what the "shape" of the Universe
> really is,

You are mistaken.  We are pretty sure that it is locally flat, i.e. the 
local curvature is zero.

> all these mathematical terms don't describe it in a way a
> person can visualize.

Measurements show that it is true regardless.  At large observable scales, 
all triangles have an angle sum of approximately 180°.

> If someone said we lived on the surface of a sphere of some determinate
> size I could visualize that, or if they said it was a fairly homogenous
> sphere we lived inside of, I could visualize that. But all I see are
> explanations of a Universe that's "bounded" or "not bounded" without an
> explanation of just what the heck that really means.

What you see is your problem.  It is a typical beginner’s mistake that 
everything that can be accepted as true also has to be visualizable.

> I suppose if you live in a Universe which you consider has no
> "outside" it's tough to give its shape except in mathematical terms.

There simply is no way for humans to understand the curvature of space or 
any other higher-dimensional object intuitively because they cannot perceive 
that.  But one can use the abstraction of a two-dimensional surface, an 
abstraction that works rather well because three-dimensional objects *can* 
be perceived by humans, and are perceived as arrangements of two-dimensional 
confining surfaces.  And because the same math can be applied.

For example, you define a cube by the arrangement of its confining 6 
surfaces which need to be squares, and the angle between adjacent surfaces 
needs to be a right angle (90°).  When you perceive such an arrangement of 
surfaces, from experience it is associated in your brain with the word 
“cube” (or whatever word in your native language).

> I'd even prefer it if someone said "we have no idea" rather than these
> murky non-explanations.

But we have an idea.  Your problem is that you did not even try to 
understand the explanations.


F'up2 sci.physics.relativity

PointedEars
-- 
Q: How many theoretical physicists specializing in general relativity
   does it take to change a light bulb?  
A: Two: one to hold the bulb and one to rotate the universe.
(from: WolframAlpha)

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Re: Where is the center of the universe? Sam Wormley <swormley1@gmail.com> - 2015-11-20 17:45 -0600
  Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-20 23:48 -0800
    Re: Where is the center of the universe? Poutnik <poutnik4nntp@gmail.com> - 2015-11-21 10:27 +0100
      Re: Where is the center of the universe? benj <none@gmail.com> - 2015-11-21 05:13 -0500
        Re: Where is the center of the universe? Poutnik <poutnik4nntp@gmail.com> - 2015-11-21 12:57 +0100
          Re: Where is the center of the universe? benj <none@gmail.com> - 2015-11-21 13:44 -0500
            Re: Where is the center of the universe? Poutnik <poutnik4nntp@gmail.com> - 2015-11-21 20:01 +0100
              Re: Where is the center of the universe? benj <none@gmail.com> - 2015-11-21 14:17 -0500
            Re: Where is the center of the universe? Poutnik <poutnik4nntp@gmail.com> - 2015-11-21 20:01 +0100
              Re: Where is the center of the universe? benj <none@gmail.com> - 2015-11-21 14:22 -0500
    Re: Where is the center of the universe? Sam Wormley <swormley1@gmail.com> - 2015-11-21 08:05 -0600
      Re: Where is the center of the universe? benj <none@gmail.com> - 2015-11-21 13:48 -0500
        Re: Where is the center of the universe? Tom Roberts <tjroberts137@sbcglobal.net> - 2015-11-23 10:21 -0600
          Re: Where is the center of the universe? Maciej Woźniak <mlwozniak@wp.pl> - 2015-11-23 17:34 +0100
          Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-23 11:31 -0800
            Re: Where is the center of the universe? rickman <gnuarm@gmail.com> - 2015-11-23 15:54 -0500
              Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-23 13:43 -0800
                Re: Where is the center of the universe? rickman <gnuarm@gmail.com> - 2015-11-23 16:49 -0500
                Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-23 16:17 -0800
              Re: Where is the center of the universe? dvus <dven1@adelphia.net> - 2015-11-24 16:52 -0500
                Re: Where is the center of the universe? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-11-24 22:24 +0000
    Re: Where is the center of the universe? Saul Levy <saullevy1@cox.net> - 2015-11-21 07:13 -0700
      Re: Where is the center of the universe? "Notroll2015" <notroll2015@charter.net> - 2015-11-21 12:48 -0600
        Re: Where is the center of the universe? Saul Levy <saullevy1@cox.net> - 2015-11-21 14:10 -0700
  Re: Where is the center of the universe? dvus <dven1@adelphia.net> - 2015-11-21 06:43 -0500
    Re: There's nothing special about the start of "the big bang". benj <none@gmail.com> - 2015-11-21 13:45 -0500
      Re: There's nothing special about the start of "the big bang". "Notroll2015" <notroll2015@charter.net> - 2015-11-21 12:51 -0600
      Re: There's nothing special about the start of "the big bang". Edward Stansfield <stansfield5REM6@linuxmail.org> - 2015-11-21 14:11 -0500
    Re: Where is the center of the universe? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-11-21 20:37 +0000
      Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-21 21:06 -0800
        Re: Where is the center of the universe? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-11-22 11:43 +0000
          Re: Where is the center of the universe? benj <none@gmail.com> - 2015-11-22 09:01 -0500
            Re: Where is the center of the universe? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-11-22 14:59 +0000
          Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-22 14:02 -0800
            Re: Where is the center of the universe? Sam Wormley <swormley1@gmail.com> - 2015-11-22 16:32 -0600
        Re: Where is the center of the universe? Saul Levy <saullevy1@cox.net> - 2015-11-22 07:18 -0700
    Re: Where is the center of the universe? Tom Roberts <tjroberts137@sbcglobal.net> - 2015-11-23 10:51 -0600
      Re: Where is the center of the universe? Arc Michael <abookoflife@yahoo.com> - 2015-11-24 13:57 -0800
      Re: Where is the center of the universe? dvus <dven1@adelphia.net> - 2015-11-24 17:07 -0500
        Re: Where is the center of the universe? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-11-24 22:48 +0000
          Re: Where is the center of the universe? Arc Michael <abookoflife@yahoo.com> - 2015-11-24 17:01 -0800
            Re: Where is the center of the universe? Saul Levy <saullevy1@cox.net> - 2015-11-25 01:20 -0700
              Re: Where is the center of the universe? Arc Michael <abookoflife@yahoo.com> - 2015-11-25 10:51 -0800
                Re: Where is the center of the universe? Saul Levy <saullevy1@cox.net> - 2015-12-03 18:13 -0700
          Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-24 21:47 -0800
            Re: Where is the center of the universe? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-11-25 10:32 +0000
              Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-25 09:47 -0800
                Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-25 21:36 -0800
                Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-26 14:22 -0800
                Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-26 14:27 -0800
                Re: Where is the center of the universe? Saul Levy <saullevy1@cox.net> - 2015-11-26 15:39 -0700
                Re: Where is the center of the universe? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-11-27 00:48 +0000
                Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-26 17:34 -0800
                Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-12-01 21:52 -0800
                Re: Where is the center of the universe? Saul Levy <saullevy1@cox.net> - 2015-12-02 09:49 -0700
        Re: Where is the center of the universe? Tom Roberts <tjroberts137@sbcglobal.net> - 2015-11-25 09:59 -0600
          Re: Where is the center of the universe? benj <none@gmail.com> - 2015-11-25 11:16 -0500
            Re: Where is the center of the universe? Tom Roberts <tjroberts137@sbcglobal.net> - 2015-11-25 11:02 -0600
              Re: Where is the center of the universe? Maciej Woźniak <mlwozniak@wp.pl> - 2015-11-25 18:47 +0100
              Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-25 10:06 -0800
                Re: Where is the center of the universe? Arc Michael <abookoflife@yahoo.com> - 2015-11-25 10:52 -0800
                Re: Where is the center of the universe? Sam Wormley <swormley1@gmail.com> - 2015-11-25 14:04 -0600
                Re: Where is the center of the universe? Arc Michael <abookoflife@yahoo.com> - 2015-11-25 12:38 -0800
                Re: Where is the center of the universe? Saul Levy <saullevy1@cox.net> - 2015-11-25 14:23 -0700
                Re: Where is the center of the universe? "Notroll2015" <notroll2015@charter.net> - 2015-11-25 15:51 -0600
                Re: Where is the center of the universe? Saul Levy <saullevy1@cox.net> - 2015-11-29 12:40 -0700
          Re: Where is the center of the universe? Maciej Woźniak <mlwozniak@wp.pl> - 2015-11-25 17:50 +0100
          Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-25 10:01 -0800
            Re: Where is the center of the universe? Sam Wormley <swormley1@gmail.com> - 2015-11-25 14:05 -0600
              Re: Where is the center of the universe? The Starmaker <starmaker@ix.netcom.com> - 2015-11-25 12:42 -0800

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