Search found 42 matches
- Sat Oct 06, 2007 3:38 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Multiple planes of space
- Replies: 12
- Views: 3582
I think the question is why are spiral galaxies not all oriented in parallel planes. We cannot see the entire universe from earth, but we can see a spherical portion of the universe from our vantage point with a radius of about 12.7 billion light years. Imagine if we did a survey of all the visible ...
- Wed Oct 03, 2007 4:53 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Comet Encke's Tail Ripped Off (APOD 03 Oct 2007)
- Replies: 10
- Views: 3431
Comet Encke's Tail Ripped Off (APOD 03 Oct 2007)
http://antwrp.gsfc.nasa.gov/apod/ap071003.html Wow!! It looks like the coronal mass ejection occurs in three waves. The first wave almost carries the comet tail away, the second wave knocks the tail off completely. By the time the third, smaller wave passes, the tail has grown back. It really makes...
- Sat Sep 29, 2007 6:57 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
- Tue Sep 25, 2007 11:35 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
It sure would be interesting to compare seismic records and tectonics from another planet about the size of Earth without a moon... ...say Venus for example Yeah, I agree....... Am I correct in stating the our Moon is the only Moon in the Solar System that is thought to have formed from a collision...
- Tue Sep 25, 2007 3:02 am
- 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
- Sun Sep 23, 2007 5:14 am
- 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
http://www.nealadams.com/nmu.html Look at clips #0, #11, and #12 on the link. Neal Adams proposed that the east coast of Africa fits up against the west coast of India. Then he has Australia and Antartica joining together and fitting against the eastern margins of Asia, which also has a major trans...
- Sun Sep 23, 2007 1:21 am
- 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
- Mon Sep 17, 2007 2:50 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: 'Hole in the Universe'? - Possible Explanation (27 Aug 2007)
- Replies: 72
- Views: 33632
Hey, Dr. Skep, I am intrigued and skeptical about time proceeding in quantum bits that cannot be subdivided. If that were true, then photons moving at the the speed of light (300 million meters per second) would not move smoothly through space, but would jump a small distance during each minimual ti...
- Thu Sep 13, 2007 5:48 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Time Tunnel (APOD 06 Sep 2007)
- Replies: 10
- Views: 5352
I read the Wikipedia article (it's worth a look and a good solid critique; I don't believe every Wiki I see) which states the age of the universe at 13.7 billion years, and the radius of our sphere of the universe at 46.5 billion light years. I'll accept those figures for the sake of discussion. I t...
- Wed Sep 12, 2007 1:33 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Time Tunnel (APOD 06 Sep 2007)
- Replies: 10
- Views: 5352
Hi Pyjam. Welcome. Assume a beam of light travelled in a straight line in a vacuum for 12.7 billion years from the quasars position in space (way back then) to our position in space (right now). With those assumptions, one can say that the those two points in spacetime were separated by 12.7 billion...
- Sat Sep 08, 2007 2:11 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: hubble
- Replies: 65
- Views: 14946
- Sun Sep 02, 2007 5:41 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: 'Hole in the Universe'? - Possible Explanation (27 Aug 2007)
- Replies: 72
- Views: 33632
Regarding Brian's suggestion that the hole in the universe is actually the center of the universe, I would have thought the the big bang would have eventually resulted in enough turbulence and diffusion, that after 13.7 billion years, some galaxies would eventually fill in the void, or at the very l...
- Tue May 15, 2007 3:05 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Where is Earth located within the Universe?
- Replies: 19
- Views: 11029
Aye, but those objects that are 20Gly from each other won't be able to see each other. Unless........ Unless they are the same object! The quasar map link rigelan posted shows a lot of mirror symmetries. This suggests the possibility that if you look at two really distant objects in opposite direct...
- Sun May 13, 2007 3:19 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Where is Earth located within the Universe?
- Replies: 19
- Views: 11029
- Tue May 08, 2007 11:06 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Where is Earth located within the Universe?
- Replies: 19
- Views: 11029
Forgive me if my thinking is excessively linear, but here is a cosmological problem that defies logic. Let us assume that our portion of the known universe is 13.7 billion years old, and it started out at a point and expanded to it's current shape and size over the past 13.7 billion years. Now let u...
- Fri Mar 16, 2007 5:02 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Lunar Occultation of Saturn (APOD 16 Mar 2007)
- Replies: 7
- Views: 2897
Lunar Occultation of Saturn (APOD 16 Mar 2007)
http://antwrp.gsfc.nasa.gov/apod/ap070316.html It appears that the Saturns don't quite line up in a straight line. I am holding a straight edge (printer paper) right up to the flat screen monitor. Could it be "camera giggle"? Or perhaps lunar gravitational distortion? Maybe at this magnif...
- Wed Sep 21, 2005 4:32 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: WOW !
- Replies: 9
- Views: 3962
WOW !
I could have sworn that today's APOD was an aerial view of Boston Harbor, rather than of a methane bay on Titan. I really did a double (actually triple) take. Compare! I found Back Bay, Goverment Center, Logan Airport, and a few harbor islands on Titan! (Yeah I know, it's a little distorted, and I s...