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Science Forum Index » Astronomy Forum » Why Are There Galaxies?
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| G=EMC^2 Glazier |
 Posted: Sun Dec 14, 2003 5:37 am |
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Hi Painius I have a picture(framed) taken by the Hubble of the
Cartwheel galaxy It has a bright oval shaped hub. I can see arms coming
out of the hub and going to the great big ring around it. The ring seems
very bright,and must have billions of stars making up its structure.
It is good this Cartwheel galaxy was not seen edge on,because than it
would look like a spiral galaxy. I wonder how common this shape galaxy
are? Almost looks like a huge explosion could have caused the ring.
Bert |
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| G=EMC^2 Glazier |
| Posted: Sun Dec 14, 2003 9:45 am |
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Hi Painius That picture you have shown to us is better than the one I
framed. (wow) There is a galaxy of to the right of the picture you have
shown that also looks like a galaxy that seems to have a ring around it.
Bert |
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| Painius |
| Posted: Sun Dec 14, 2003 1:16 pm |
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Absolutely gorgeous!
http://antwrp.gsfc.nasa.gov/apod/ap981219.html
"G=EMC^2 Glazier" <herbertglazier@webtv.net> wrote in message...
news:9963-3FDC83D3-172@storefull-2354.public.lawson.webtv.net...
Quote:
Hi Painius I have a picture(framed) taken by the Hubble of the
Cartwheel galaxy It has a bright oval shaped hub. I can see arms coming
out of the hub and going to the great big ring around it. The ring seems
very bright,and must have billions of stars making up its structure.
It is good this Cartwheel galaxy was not seen edge on,because than it
would look like a spiral galaxy. I wonder how common this shape galaxy
are? Almost looks like a huge explosion could have caused the ring.
Bert
happy days and...
starry starry nights!
--
Life without love is
A lamp without oil,
Love without prejudice,
A tool without toil--
World without soil.
Paine Ellsworth |
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| G=EMC^2 Glazier |
| Posted: Mon Dec 15, 2003 12:27 pm |
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Well I started this post,and still have not recieved an answer from the
well read know it alls Why Are There Galaxies? Bert |
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| OG |
| Posted: Mon Dec 15, 2003 5:50 pm |
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"G=EMC^2 Glazier" <herbertglazier@webtv.net> wrote in message
news:9963-3FDE356F-389@storefull-2354.public.lawson.webtv.net...
Quote: Well I started this post,and still have not recieved an answer from the
well read know it alls Why Are There Galaxies? Bert
Why are there galaxies?
because at the early stages of the universe, small local densities acted as
centres of gravity, so that they acted as nucleii for condensation of mass.
Remember, in a completely uniform universe, the density remains uniform. BUT
any departure from uniformity acts to destroy uniformity.
So the universe tended towards clumpiness, and galaxies formed in clusters.
> |
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| G=EMC^2 Glazier |
| Posted: Tue Dec 16, 2003 3:51 am |
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OG If denser gravity areas caused galazies,than can we theorize that
blackholes made these area denser? Looks that way. Bert It
is gravity all the way down |
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| OG |
| Posted: Tue Dec 16, 2003 2:04 pm |
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"G=EMC^2 Glazier" <herbertglazier@webtv.net> wrote in message
news:28142-3FDF0DE5-389@storefull-2351.public.lawson.webtv.net...
Quote: OG If denser gravity areas caused galazies,than can we theorize that
blackholes made these area denser? Looks that way. Bert It
is gravity all the way down
You may theorise that primordial BHs are the cause of the initial local
densities, but there's probably no need for them.
I think I saw somewhere that the WMAP studies have shown an upper limit to
the size/number of primordial BHs - but I could be wrong here.
BHs are likely to have been formed soon enough after the first star
formation events anyway, particularly since large stars can have very short
lifespans, the timescale between initial star formation and the first
'stellar' BHs could be a milllion years or less.
NB I'm not saying that there were BHs in the first million years after the
BB, simply that BHs were possible very soon after the first stars. |
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| G=EMC^2 Glazier |
| Posted: Sun Dec 21, 2003 5:08 am |
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OG The first stars were big and dense,and after burning for 25 million
years they collaped and created blackholes. Blackholes were needed to
make space clumpy. That swirling gas clouds could form around these BH
and give birth to stars. We call this clumpy area a galaxy. Bert |
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