How bright could the Galactic Centre be (visible light)?

dean · Post by **dean** » Tue Oct 04, 2005 4:04 pm

Relative to our sun, how bright could the Galactic Centre be (visible light) if there was no dust? Given the number of stars, would there be a solid line of light across the sky?

JohnD · Post by **JohnD** » Tue Oct 04, 2005 6:07 pm

Today's APOD purports to be the Milky Way, but is it? Or another galaxy (far, far away?) that happens to be of the same sort and seen edge on from here?

JOhn

(click here or scroll below - added by makc)

lllbr0kenlll · Post by **lllbr0kenlll** » Tue Oct 04, 2005 10:57 pm

if that was the case..
it'd be far far away....but reeeeeally close ,comparitivly (sp?)
yeah?
weird thought though

AMiles · Post by **AMiles** » Wed Oct 05, 2005 7:42 am

great photo of the milky way

i notice there's a thin curved wake on the left side of the photo
starting low and shooting upward...

is that just a glitch in the photo, or something real?

Empeda · Post by **Empeda** » Wed Oct 05, 2005 11:19 am

JohnD wrote:Today's APOD purports to be the Milky Way, but is it? Or another galaxy (far, far away?) that happens to be of the same sort and seen edge on from here?

The milky way is visible from all around the globe (ie. we're in the disk) - if it was another galaxy you would only see it in one direction.

Like the idea though - imagine everyone's response if they suddenly found out that we weren't in it!

JohnD · Post by **JohnD** » Thu Oct 06, 2005 10:31 am

Sorry to be pedantic, but no one has answered my question.

Which is, what is the galaxy shown in that APOD? It looks to be taken from outside the galaxy shown, so it can't be the Milky Way, as we're in it!
It could easily be a view of a distant galaxy seen edge on.

Or, as I think Empeda implies, this is a composite, like photos taken of the wals of a room from the centre and assembled into a 360 degree strip, or the panoramic pics from the Mars Rovers.

But which is it.
The caption is unclear.

I'll ask Serge Brunier

John

Empeda · Post by **Empeda** » Thu Oct 06, 2005 1:01 pm

JohnD wrote: It could easily be a view of a distant galaxy seen edge on.

If it were it would have to be seriously close to us - we'd have noticed it I think!

The image is a series of wide-angle exposures taken in Chile, so to answer your question - yes, it's a composite (but not a 360 degree one).

JohnD · Post by **JohnD** » Sat Oct 08, 2005 9:59 am

All,
Serge Brunier has kindly replied to my query, as follows;
__________________________________________

:-(((((((((((

Dear John,
I'm frustrated by your mail : I think to this picture nearly one year before
to go to Chile to take it...

My intention was to SHOW OUR MILKY WAY AS IT WAS SEEN FROM OUTSIDE, as a Galaxy.............

Unfortunately, the bosses of APOD seems to not understood !!!!!!!!!

Anyway, of course, I m very happy to have been published in APOD !!

The picture was taken in last June, in Atacama desert, were the galactic
center is just overhead at midnight, with a fisheye lens...

Thanks to you to understand the picture !!!!!!!

:-))))))

Serge

_______________________________________
Thank you, Serge - You're a star!

BMAONE23 · Post by **BMAONE23** » Sat Oct 08, 2005 4:00 pm

It is of a portion of a galaxy that is some 70,000 LY across and seen at a distance of approx ?25000 LY? our relative distance to the center.
http://antwrp.gsfc.nasa.gov/apod/ap051004.html

craterchains · Post by **craterchains** » Wed Oct 12, 2005 5:07 pm

It is always a great satisfaction when a mystery is solved.

Our galaxy, the Milky Way, is beautiful in all it's wonders.

Imagine if you would, standing on a planet similar to earth, near the center of our galaxy.
What would the heavens look like at night?

Breath takingly beautiful, but bring your night shades.

S. Bilderback · Post by **S. Bilderback** » Thu Oct 13, 2005 12:28 am

I think you would need to bring your high energy, gamma ray deflection pajamas also, near the center of the galaxy is a much more hostile environment. In another 5 to 10 years the Voyagers should be able to tell us what the sun's heliosphere is protecting our solar system from, (high-energy nebula winds), just a milder version of the stuff that increases exponentially as the galactic center is approached.

http://voyager.jpl.nasa.gov/

http://www.cnn.com/2005/TECH/space/10/1 ... index.html

craterchains · Post by **craterchains** » Sat Oct 15, 2005 11:47 pm

Seems I should bring my Sun Block 2000 for night time strolls then.

Could an atmosphere be thick enough and yet clear enough to provide a view I wonder?
Brave little craft those Voyagers.

"He dwells in unapproachable light."
Just a side thought.

Norval

S. Bilderback · Post by **S. Bilderback** » Sat Oct 15, 2005 11:54 pm

All that is needed is a Sun with one heck of a heliosphere.

Starship Asterisk*

How bright could the Galactic Centre be (visible light)?

How bright could the Galactic Centre be (visible light)?

umm

Confirmation from the source