Date: Apr 29, 2013 2:05 PM
Author: Rich Delaney
Subject: Re: closed universe, flat space?
On Apr 24, Shmuel (Seymour J.) Metz

<spamt...@library.lspace.org.invalid> wrote:

> >>Supposedly, our universe is closed and finite,

> >>although the geometry and topology isn't precisely > > >>known. This means a straight line (geodesic)

> >>traveler must return to his starting

> >> point, yes/no? Hence, curved space.

>

> >>At the same time, astronomers claim, that space

> >>is flat, to the precision of their measurements.

>

> >>So, space is closed, but also flat... back in

> >>my day, they had something called a logical

> >>contradiction...

> No, the questions are why the OP is making a false

> claim and and why the OP is falsely claiming a

> logical contradiction.

>

> "Supposedly, our universe is closed and finite"

> is untrue; what is true is that GR allows for the

> possibility and that a sufficiently

> latge density of matter would require it. The observed

> density isn't large enough.

First, it's still unsettled.

Second, for the purposes of this question -

its motivation - we can hypothesize a closed

universe.

> What is worse is that there is no logical

> contradiction between a

> closed universe and a flat universe.

1) "The earth is flat."

2) "If you drive/sail in a straight line,

you return to your starting point."

Contradiction.

QED

It could hardly be simpler.

--

Rich