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Old 02-19-2011, 07:24 AM   #1
kennyc
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Astronomy pic of the day
I thought this one particularly impressive:

A mere 46 million light-years distant, spiral galaxy NGC 2841 can be found in the northern constellation of Ursa Major.

http://apod.nasa.gov/apod/astropix.html
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Old 02-19-2011, 07:54 AM   #2
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A place of birth ....
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Old 02-19-2011, 09:17 AM   #3
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OK, me stupid - what shines so bright in the middle?
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Old 02-19-2011, 09:31 AM   #4
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OK, me stupid - what shines so bright in the middle?

supposedly [snip] "a bright cusp of starlight marks the centre" [/snip]
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Old 02-19-2011, 09:37 AM   #5
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OK, me stupid - what shines so bright in the middle?
The stars are more dense in the center and the light is dispersed by dust/gas giving more of a "glow" in the center.

At least that's my explanation/belief.
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Old 02-19-2011, 10:47 AM   #6
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A place of birth ....
So that's where you're from, eh?
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Old 02-19-2011, 10:58 AM   #7
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I always felt there was something a bit unusual about Geoff..... hmmm....
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Old 02-19-2011, 03:10 PM   #8
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Breathtaking picture. BTW, if you're interested in Astronomy and Physics, I'm about a third of the way into Brian Greene's latest book, Hidden Reality and, so far, it is very interesting.
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Old 02-19-2011, 03:57 PM   #9
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Hey Mike thanks for the recommendation. I'll check it out! He's a great writer!
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Old 02-19-2011, 04:02 PM   #10
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Quote:
Originally Posted by kennyc View Post
The stars are more dense in the center and the light is dispersed by dust/gas giving more of a "glow" in the center.

At least that's my explanation/belief.
It's primarily because it over-saturates the imaging device. As an astro-photographer myself, it's extraordinary difficult to get a nice-looking image that shows both the nucleus and the spiral arms of a galaxy, because the nucleus is so much brighter. You end up either with an over-exposed nucleus and nice-looking spiral arms, or a correctly exposed nucleus and almost invisible spiral arms.
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Old 02-19-2011, 05:56 PM   #11
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thanks all for the explanations! I guess the part with black holes in the middle of galaxies was not meant for all of them
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Old 02-20-2011, 03:09 AM   #12
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thanks all for the explanations! I guess the part with black holes in the middle of galaxies was not meant for all of them
No, there is indeed a black hole in the centre of pretty much every galaxy, but it's an EXTREMELY small object. You can't see it (obviously!); they are detected by their X-ray emissions.
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Old 02-20-2011, 07:28 AM   #13
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It sounds so obvious when someone explains it
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