Why Are There Galaxies?

"Painius" wrote in message ...


Say "hi" to Rod Serling for me, and i have a sillyass gut
feeling that people are underestimating the brightness
of our Galaxy Central by several increments. "Sillyass"
because there is unfortunately no way to be certain.

And i know just as sure as i know how to pound these
keys that the hub of the Milky Way Galaxy is bright
enough to rival the Sun!


I would hope you type better than that Panius :-). No, it wouldn't
even come close to rivaling the sun's brightness unless, perhaps, if
you were observing the hub from, say, around 1000 light years or so of
the center. Even then, the brightness would be spread over a huge
area of the sky, so while you would see a *lot* of stars and much of
the sky would probably seem to be glowing, it wouldn't quite be like
having the sun up. The brightness of the core region can be quite
easily calculated based on infrared and radio studies, as well as
comparisons with the cores of other similar galaxies like M31. People
aren't significantly understimating the brightness by any means. Even
without dust in the way, 26,000 light years is a *long* way for light
to travel, and the inverse square law really takes its toll here.
Clear skies to you.

David W. Knisely
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

**********************************************
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Hi Painius That is so very true we can't tell how bright the hub of our
galaxy is. Its a good thing that infrared can go through all that space
dust. It does make sense to me that this dust would be thick and flat to
go with our frisbee galaxy. Painius what if we did not have this
dust shield,and lots of harmfull radiation hit the Earth? Maybe the dust
helped to create life on Earth. Having stars inside this hub that have
the radiation of millions of suns,and the hub has 100 million stars
makes this thinking not to far out. Having a blackhole in the center of
the hub must create a lot of angular motion. Bert

Hi Painius Just had this interesting thought. the stars that make up
the hub and have a 2.6 million solar mass blackhole at their center must
be revolving around it very fast. How fast is very fast? Lots of stars
must be falling through the event horizon every day. Stars of great mass
could be colliding(gut feeling thats true) To much stuff and angular
motion in a small area can cause choas. Bert

"G=EMC^2 Glazier" wrote in message
...
Hi Painius Just had this interesting thought. the stars that make up
the hub and have a 2.6 million solar mass blackhole at their center must
be revolving around it very fast. How fast is very fast? Lots of stars
must be falling through the event horizon every day. Stars of great mass
could be colliding(gut feeling thats true) To much stuff and angular
motion in a small area can cause choas. Bert


Bert,

If you have Adobe reader, you may find this
http://www.nature.com/cgi-taf/DynaPa...t_filetype=pdf

of interest. (Don't forget the link may get broken by my/your newsreader).


DaveL

Astronomers tell us the stars in our galaxy are in lock step. They turn
like the spokes in a wheel. That is true of stars inside the hub.
Because of the great gravity of that huge BH they have to revolve around
the blackhole so very fast that the gravitation that keeps our sun in
lock step with the rest of the galaxy has no effect on stars making up
the hub. Not in the books but that is the way I see it. Bert

My post says inside the hub. It should read outside the hub,and inside
the hub ithe stars are not in lock step Bert

"G=EMC^2 Glazier" wrote in message
...
My post says inside the hub. It should read outside the hub,and inside
the hub ithe stars are not in lock step Bert

It's kind of hart to tell what you mean when you use terms like "in lock
step", but it sounds like you had it right (sort of) the first time.

The bulge exhibits characteristics of solid-body rotation, the disk exhibits
characteristics of differential rotation.

"G=EMC^2 Glazier" wrote in message...
...

Hi Painius Just had this interesting thought. the stars that make up
the hub and have a 2.6 million solar mass blackhole at their center must
be revolving around it very fast. How fast is very fast? Lots of stars
must be falling through the event horizon every day. Stars of great mass
could be colliding(gut feeling thats true) To much stuff and angular
motion in a small area can cause choas. Bert

I don't think anyone really knows how fast, Bert. I *do*
know that most people have some idea that stars are
"thick as thieves" at the galaxy hub, but once you get
there, it's like the asteroid belt. The stars are far
enough apart to mean that collisions are very few and
far between.

I could be wrong, but i don't think the black hole grows
very fast.

Here's a neat article...

http://www.nature.com/nsu/020107/020107-9.html

....raises LOTS of questions, doesn't it.

happy days and...
starry starry nights!

--
Your heart up hanging on the wall
Just dripping tears so painfully,
You ne'er felt love so true as mine,
I want your heart inside me.

Protected from all manner, form
And shape of harm it will e'er be,
If you say no, I fade and die,
I need your heart inside me.

Paine Ellsworth

Hi Painius Thanks for that site. Seems the Milky Way hub is a very
dynamic place I like our spot in right field a lot better. Bert

"G=EMC^2 Glazier" wrote in message...
...

Hi Painius Thanks for that site. Seems the Milky Way hub is a very
dynamic place I like our spot in right field a lot better. Bert

Welcome!

Yes, it appears that for our form of life, i.e. carbon-based,
we're all better off being the hicks of the Milky Way!

Other possible bases for life might be...

silicon
germanium
tin
lead
ununquadium

This is just a reflection that i perceive from the periodic
table of the elements. Carbon-based is probably the
toughest form of life. If a carbon-based lifeform cannot
live at the hub of the Galaxy, nobody can. I *could* be
wrong about this.

Ununquadium-based life would be a manufactured form.

We're not ready for this, are we.

happy days and...
starry starry nights!

--
a Secret of the Universe...
so please don't breathe a word of this--
the Moon above will smile perverse
whene'er it sees two lovers kiss;
(breathe not a single word of this!)

Paine Ellsworth