Re: Expanding

Dear F. Kuik:

"F. Kuik" <f.kuik@xxxxxxxxxx> wrote in message
news:d4uk79$83d$1@xxxxxxxxxxxxxxxxxx
>
> "N:dlzc D:aol T:com (dlzc)" <N: dlzc1 D:cox T:net@xxxxxxxxxx>
> schreef in bericht news:E7Ace.28$D91.19@xxxxxxxxxxxxx
....
>>> So when we look at the far end of our universe we would
>>> not see that earliest material because of the
>>> large redshift. (Eventually infinite redshift?)
>>
>> Correct. We "see" with radio, but resolution is still pretty
>> poor.
>>
>>> Why does the "edge" move away with velocity c ?
>>
>> "The edge" doesn't move away with any velocity we know of.
>> Current thinking is that there is no "edge" to the Universe,
>> only a horizon beyond which we cannot see. The CMBR is
>> supposed to be that horizon, in the time axis... since it
>> supposed to be optically opaque.
>>
>> Beyond this, our "horizon" moves with us through time, so it
>> is no surprise that this gives the illusion of an "edge moving
>> at c". Additionally, acceleration of expansion will serve to
>> shorten the "distance" to the "horizon".
>>
>> In case you haven't seen this link...
>> URL:http://www.astro.ucla.edu/~wright/cosmo_01.htm
>
> If you H0 to be 72 the universe would be about
> 14billion lightyears old

A "choice" of H0 is inconsequential to the age of the Universe.
It is the correlation between events at some distance/age and
now. We can see the CMBR, because this light was already well on
its way to us from the first. We are also seeing objects closer
and closer to the CMBR (about 13.4 Gy), although we are still a
good ways off.

> because that's where it would have a recession
> velocity of c. Why would someone conclude this?

Because it agrees with observation of ancient events (like the
emission of characteristic spectra). The age of the Universe is
a separate measurement, and has been corroborated a few different
ways. I don't believe the choice of H0 is one of them.

David A. Smith


.

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