Re: expansion



On Jan 28, 4:35 pm, Sam Wormley <sworml...@xxxxxxxxx> wrote:
Michael Moroney wrote:
john280109 <vega...@xxxxxxxxxxxxx> writes:

For there to be expansion where all points are
accelerating away from each other, there has to be
a center. Otherwise you got stuff going all directions.
Therefore if you subscribe to 'expanding universe',
you subscribe to 'we are the center'.

Where is the center of the surface of an inflating balloon, on which all
points are receding from each other?

All points on the surface of that balloon are equally the center.

Well, it's pretty trivial that a perfect sphere has
a surface that's identical in all directions.
This is not true of a balloon. There's the
little matter of the nozzle. Now, if you paint spots
on your sphere's surface and then expand the
sphere, all the spots *do not* distance themselves equally;
spots directly opposite each other, i.e. the two
axes, will go at the rate of growth of the diameter-
points closer than half circumference will separate
faster.
Oh, now you want to imagine the
balloon's surface to be flat as well?

OK, wait, in order to explain the greater
universe, which we assume to be real, you want to
equate it with something having no center, and also you want
it to have no edge- neither of which conditions has been seen
in anything real to my knowledge.
Plus, you say there's no edge, but you say it's expanding-
expanding with relation to what? Is the whole universe expanding?
And if not, then what?

Gobbledegook- good going physics 2009. Yikes.

john
.



Relevant Pages

  • Re: The Raychaudhuri Equation and Expansion-Contraction
    ... We go back to a point (a string will also do; ... according to which the point is aware of all directions around it. ... bounded by an expanding sphere. ... to change at all and we're left with a "still-born point universe". ...
    (sci.physics)
  • Re: expansion
    ... Otherwise you got stuff going all directions. ... Therefore if you subscribe to 'expanding universe', ... Now, if you paint spots ...
    (sci.physics)
  • Re: expansion
    ... Otherwise you got stuff going all directions. ... Therefore if you subscribe to 'expanding universe', ... And the expansion has no center. ...
    (sci.physics)
  • Re: Gravity
    ... the universe is expanding in all directions. ... Is it possible to view gravity not as a pull force ... the universe is expanding in all directions. ...
    (sci.physics)
  • Re: The reality of entity
    ... The assumption is that redshift is entirely due to Doppler shift, ... us appear to be at the center of the universe. ... difficult to say that space itself is expanding and than use a stable ... ignites the radiation and this energy expands back out, ...
    (sci.philosophy.meta)

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