Re: Most Distant Galaxy - What's wrong with this statement?

Posted by Roger Critchlow-2 on Oct 24, 2013; 9:46pm
URL: http://friam.383.s1.nabble.com/Most-Distant-Galaxy-What-s-wrong-with-this-statement-tp7584094p7584096.html

 (30-13.1) / 13.1 = 1.29 light-years / year.

-- rec --

On Thu, Oct 24, 2013 at 3:25 PM, <[hidden email]> wrote:

>  From the BBC at http://www.bbc.co.uk/news/science-environment-24637890
> (today)
>

> /Because it takes light so long to travel from the outer edge of the

> Universe to us, the galaxy appears as it was 13.1 billion years ago (its
> distance from Earth of 30 billion light-years is because the Universe is

> expanding)./

I don't see much wrong with it (though I don't know if it's a true statement).
"Galaxy X was 13.1 billion light-years from here-and-now, along a light-like
geodesic, when it emitted the radiation we are presently detecting.  The present
location of Galaxy X (assuming the truth of present physical theories, etc.) is,
partly because the Universe has been expanding, 30 billion light-years from
here-and-now, in the sense that (with the same disclaimer) radiation we are
presently emitting will be detectable at Galaxy X in 30 billion years." Does
my attempt at paraphrase go beyond, or not as far as, the original?  If not,
what's wrong with the paraphrase?

Lee Rudolph

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