Do spiral galaxies form from the inside out?

Do spiral galaxies form from the inside out?
http://physicsworld.com/cws/article/news/45677

On Fri, 15 Apr 2011 08:33:43 GMT, Jan Panteltje
wrote:

Do spiral galaxies form from the inside out?
http://physicsworld.com/cws/article/news/45677
This article invites one to make a comment. I tried.
It makes me mad all over again trying to bust through their precious
password screening exercise, typing crazy words, and failing after
repeated efforts. What in tarnation are they guarding so assiduously?

In any case I think they miscalculated the age of the galaxy, if we
use the commonly accepted a = a0/1+z, which gives13.7/1.49 = 9.19 Byr
AGE not lookback time, if I'm not mistaken. They give the age as 4.4
Byr., 13.7 -9.19.

Most such articles are strewn with red shift/age figures and I'd be
interested to see the relevant function employed. I think we all
would.
John Polasek

This article invites one to make a comment. I tried.
It makes me mad all over again trying to bust through their precious
password screening exercise, typing crazy words, and failing after
repeated efforts. What in tarnation are they guarding so assiduously?
In any case I think they miscalculated the age of the galaxy, if we
use the commonly accepted a = a0/1+z, which gives13.7/1.49 = 9.19 Byr
AGE not lookback time, if I'm not mistaken. They give the age as 4.4
Byr., 13.7 -9.19.
Most such articles are strewn with red shift/age figures and I'd be
interested to see the relevant function employed. I think we all
would.
John Polasek
On Fri, 15 Apr 2011 08:33:43 GMT, Jan Panteltje
wrote:

Do spiral galaxies form from the inside out?
http://physicsworld.com/cws/article/news/45677

Dear John Polasek:

On Apr 15, 7:05*am, John Polasek wrote:
On Fri, 15 Apr 2011 08:33:43 GMT, Jan Panteltje

wrote:
Do spiral galaxies form from the inside out?
http://physicsworld.com/cws/article/news/45677

This article invites one to make a comment. I tried.
*It makes me mad all over again trying to bust
through their precious password screening exercise,
typing crazy words, and failing after repeated efforts.
What in tarnation are they guarding so assiduously?

They are trying to end up with comments from people, hopefully that
read their artilce, rather than a few hackers looking for free
advertising. Unfortunately, they could not get yours, because they
don't know what they are doing. They are trying to orifice the front
end, so they don't have to spend time selectively deleting "comments".

David A. Smith

In article ,
John Polasek writes:
In any case I think they miscalculated the age of the galaxy, if we
use the commonly accepted a = a0/1+z, which gives13.7/1.49 = 9.19 Byr

I have no idea where you got the above or why you think it's
"commonly accepted." If you want to calculate distance, age, or
other parameters from redshift, use Ned Wright's calculator:
http://www.astro.ucla.edu/~wright/CosmoCalc.html

At least this is the commonly accepted version. If you have your own
"theory," I can't help you.

--
Help keep our newsgroup healthy; please don't feed the trolls.
Steve Willner Phone 617-495-7123
Cambridge, MA 02138 USA

On 15/04/2011 4:33 AM, Jan Panteltje wrote:
Do spiral galaxies form from the inside out?
http://physicsworld.com/cws/article/news/45677


Good stuff.

Yousuf Khan

On Fri, 15 Apr 2011 21:31:31 +0000 (UTC),
(Steve Willner) wrote:

In article ,
John Polasek writes:
In any case I think they miscalculated the age of the galaxy, if we
use the commonly accepted a = a0/1+z, which gives13.7/1.49 = 9.19 Byr

I have no idea where you got the above or why you think it's
"commonly accepted." If you want to calculate distance, age, or
other parameters from redshift, use Ned Wright's calculator:
http://www.astro.ucla.edu/~wright/CosmoCalc.html

At least this is the commonly accepted version. If you have your own
"theory," I can't help you.
There's no point in getting sniffy about it.
See Wiki
It's the basis of cosmological red shift and it's being pushed on all
sides as we are being prevailed upon to stop using Doppler:
1+z = anow/athen or,
a=a0/1+z
as if space stretches, presumably an expedient (and ingenious) way to
overcome the limitations of, (and to abolish) Doppler at high-z.
I have better science than that.
John Polasek
John Polasek