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Dunash
2002-Feb-13, 08:51 AM
Don't some hold that the fact that no spiral galaxy arms have been seen wound up more than 3 times limit their age to not more than 200 million years?!

http://news.bbc.co.uk/hi/english/sci/tech/newsid_1813000/1813648.stm

GrapesOfWrath
2002-Feb-13, 09:03 AM
I would have sworn we were discussing this galaxy somewhere other than this thread (http://www.badastronomy.com/phpBB/viewtopic.php?topic=572&forum=4&9). It appears that the galaxy has been involved in a collision--there are actually arms that point in both directions.

O, now I remember. Different board (http://www.nw.uklinux.net/bbs/messages/3707.html). Hi JW.

<font size=-1>[Fixed senior moment]</font>

<font size=-1>[ This Message was edited by: GrapesOfWrath on 2002-02-13 04:10 ]</font>

2002-Feb-13, 10:52 AM
<a name="20020213.4:19"> page 20020213.4:19 aka Galaxy Age
On 2002-02-13 04:03, GrapesOfWrath wrote: To: 4:20:20 A.M.
I would have sworn we were discussing this galaxy somewhere other than this thread (http://www.badastronomy.com/phpBB/viewtopic.php?topic=572&forum=4&9). It appears that the galaxy has been involved in a collision--there are actually arms that point in both directions.

O, now I remember. Different board (http://www.nw.uklinux.net/bbs/messages/3707.html). Hi JW.

<font size=-1>[Fixed senior moment]</font>
i've always thought that the horns of Galaxies
should indicate age just like Goat HORNS do
[/quote]

GrapesOfWrath
2002-Feb-13, 12:06 PM
On 2002-02-13 05:52, HUb' wrote:
i've always thought that the horns of Galaxies
should indicate age just like Goat HORNS do

And car horns should indicate the age of the driver. That way you'd know whether you have to get out of the way or not.
<center>
http://sentient.home.mindspring.com/dan/counter.jpg</center>

ToSeek
2002-Feb-13, 01:13 PM
On 2002-02-13 03:51, Dunash wrote:
Don't some hold that the fact that no spiral galaxy arms have been seen wound up more than 3 times limit their age to not more than 200 million years?!


That's based on a misunderstanding of galactic arms: the current theory is that they're pressure waves, not bands of stars grouped together. So there's no "winding up" involved.

David Simmons
2002-Feb-13, 02:48 PM
On 2002-02-13 03:51, Dunash wrote:
Don't some hold that the fact that no spiral galaxy arms have been seen wound up more than 3 times limit their age to not more than 200 million years?!

http://news.bbc.co.uk/hi/english/sci/tech/newsid_1813000/1813648.stm


Ergo the universe is 10000 years old and the earth is its stationary center?

The Bad Astronomer
2002-Feb-19, 10:45 PM
On 2002-02-13 03:51, Dunash wrote:
Don't some hold that the fact that no spiral galaxy arms have been seen wound up more than 3 times limit their age to not more than 200 million years?!


If these people do hold this, they need to educate themselves on what a spiral arm is, because they are wrong.

They can even read an article I wrote on this very issue (http://www.astronomy.com/content/dynamic/articles/000/000/000/759xfrrm.asp).