Search found 144 matches
- Fri Jun 06, 2008 3:16 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Two-Armed Spiral Milky Way (2008 Jun 06)
- Replies: 29
- Views: 9446
APOD: Two-Armed Spiral Milky Way (2008 Jun 06)
I think its incredible how we can take a side on view of the milky way, the perspective we get from this planet, and project a top view of it. How do we REALLY know if there are two or four arms? It looks the same from the side. But we have all these little intricate models, and its pretty exciting ...
- Sun May 18, 2008 1:46 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Logarithmic Spirals (APOD 17 May 2008)
- Replies: 20
- Views: 6985
- Mon Apr 21, 2008 11:35 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Galaxy rotation, Spiral Galaxies in Collision (20 Apr 2008)
- Replies: 16
- Views: 8572
- Sun Apr 20, 2008 7:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Galaxy rotation, Spiral Galaxies in Collision (20 Apr 2008)
- Replies: 16
- Views: 8572
The galaxies are classified by shape according to our wikipedia friend here:
http://en.wikipedia.org/wiki/Galaxy_mor ... sification
Spirals, Ellipticals, are grouped together. All others are remnants of mergers, and irregular.
http://en.wikipedia.org/wiki/Galaxy_mor ... sification
Spirals, Ellipticals, are grouped together. All others are remnants of mergers, and irregular.
- Wed Feb 27, 2008 1:15 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Properties of sulfuric acid (APOD 26 Feb 2008)
- Replies: 23
- Views: 5842
- Sun Feb 10, 2008 5:25 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Abell 2218: A Galaxy Cluster Lens (APOD 10 Feb 2008)
- Replies: 21
- Views: 6588
- Sat Jan 19, 2008 9:39 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Aurora, Stars, Meteor, Lake, Alaska (2007 Oct 09)
- Replies: 29
- Views: 6806
I can see the two pictures that were posted in this forum. And yes they are similar, in that they both show the same thing: an aurora. But to translate one image to another just to post it on APOD would be pointless. The photoshop work required would be quite a bit to change the aurora shape, the la...
- Wed Jan 16, 2008 10:44 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Mercury / MESSENGER APOD of 2008 January 16 Updated
- Replies: 16
- Views: 14365
There is so much iron in it that it reminds me of what might be a core remnant of a gas giant that has had ALL it's atmosphere stripped by solar winds. Whoa! What a thought. Never had any thought that that might exist. Except do we know what minerals are in the center of our four gas giants? I thin...
- Mon Dec 24, 2007 1:17 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Solstice trivia question (APOD 22 Dec 2007)
- Replies: 7
- Views: 3821
- Sun Dec 23, 2007 5:45 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Solstice trivia question (APOD 22 Dec 2007)
- Replies: 7
- Views: 3821
- Sun Dec 23, 2007 12:20 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Solstice trivia question (APOD 22 Dec 2007)
- Replies: 7
- Views: 3821
- Wed Dec 19, 2007 3:41 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Holographic Principle (APOD 16 Dec 2007)
- Replies: 24
- Views: 7228
- Mon Dec 17, 2007 10:55 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Holographic Principle (APOD 16 Dec 2007)
- Replies: 24
- Views: 7228
- Mon Dec 10, 2007 11:27 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Fairy of Eagle Nebula (APOD 09 Dec 2007)
- Replies: 6
- Views: 3122
- Mon Nov 26, 2007 3:18 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Iridescent Cloud - astronomy connection? (APOD 25 Nov 2007)
- Replies: 10
- Views: 3336
- Sun Nov 18, 2007 6:55 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Pleiades (APOD 18 Nov 2007)
- Replies: 10
- Views: 3090
Pleiades (APOD 18 Nov 2007)
I've always loves the pleides. Every time they come around in the evening, the weather has started to cool here in Iowa. So I know winter is coming. The Pleides and Orion are my winter staples. I've heard that the Pleides, M45, Seven Sisters, is also known by the name Subaru. http://antwrp.gsfc.nasa...
- Wed Nov 07, 2007 12:24 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Flare Region on the Sun - Liquid? (APOD 06 Nov 2007)
- Replies: 4
- Views: 1852
You can kinda of guess at the size of it based upon the curvature of the sun, it looks like the front picture may be 1/32 of the sun's circumference. The sun is wide, massive. See as the sun's radius is 700000 km, 2 * pi * r = 4.4 million kilometer circumference. Divide that by 32 = 150,000 km wide ...
- Sat Nov 03, 2007 8:37 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Comet Holmes: Orbital Parameters
- Replies: 1
- Views: 1216
I believe JPL has some information. Maybe they have more, but I didn't look any further.
http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Holmes&orb=1
http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Holmes&orb=1
- Fri Nov 02, 2007 9:52 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Extent of space (APOD 23 Mar 2006)
- Replies: 103
- Views: 28134
I don't think a minimum size of object means that you must have a maximum number of objects. Masswise, I think that there are only so many particles in the universe. Even though it goes beyond our perception of 14 billion years, I believe it exists. Whether that happens to be 10^50 particles or 10^1...
- Tue Oct 23, 2007 3:10 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Will the Universe End in a Big Rip? (APOD 21 Oct 2007)
- Replies: 17
- Views: 5683
i'm not thinking there will be an antiphoton. a photon occurs with the annhilation of a particle and its' anti. They both dissapear and produce light. So its like the middle ground between the two anti-s. If a photon and an anti-photon hit each other and annhililated, what would the new form of the ...
- Fri Oct 19, 2007 2:28 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Hole in the clouds? What is this?
- Replies: 13
- Views: 3963
- Mon Oct 01, 2007 12:31 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: A Milky Way Band - galactic center (APOD 30 Sep 2007)
- Replies: 4
- Views: 2073
- Sun Sep 30, 2007 9:03 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: A Milky Way Band - galactic center (APOD 30 Sep 2007)
- Replies: 4
- Views: 2073
The galactic center is towards the constellations of sagittarius and scorpius. Up here in Iowa, at 42 degrees north, the galactic center is only visible to the south during the summer. In the southern hemisphere, it would be visible all year long. And by the way, I have a lovely panorama hanging on ...
- Thu Sep 27, 2007 9:41 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Pangea Ultima: Earth in 250 Million Years? (APOD 22 Sep 07)
- Replies: 58
- Views: 17523
Well, masses are measured using balances. The force of gravity upon the mass is compared to the force of gravity upon a second mass. If the gravity had changed, it should have absolutely zero effect upon the mass of the iridium-platinum kilogram standard. The balance would still be level because bot...
- Wed Sep 26, 2007 10:48 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Pangea Ultima: Earth in 250 Million Years? (APOD 22 Sep 07)
- Replies: 58
- Views: 17523
Assuming a perfectly spherical earth, The gravitational acceleration at the surface of the earth would be a=G M / R^2 G is a constant. And in this particular situation, we are keeping the (M)ass of the earth constant, and yet expanding the (R)adius of the earth. So M is a constant, but R is increasi...