Search found 304 matches
- Tue Nov 14, 2006 10:16 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Stars don't "evolve" (APOD 12 Nov 2006)
- Replies: 28
- Views: 12166
Indeed Qev. In this case evolution means the evolution of a single star during its lifetime. Its difficult to come up for a better term to describe this, as stars change dramatically as they age, in ways that depend on their intial mass and element abundance. A star like the sun will start the main ...
- Tue Nov 07, 2006 1:34 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Universe Not Spherical
- Replies: 48
- Views: 15054
I said that I am not a physicist or astronomer and yet you replied to me with a lot of technical stuff that is far beyond my ability to participate. I consider that to be rude; that is, you are talking down to me. You asked whether or not your theory was correct, how can I respond to that if I can'...
- Wed Nov 01, 2006 9:15 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Origins of the UNIVERSE
- Replies: 829
- Views: 148189
There is nothing in the WMAP data to support BB theory as it relates to the CMBR data. That comment is patently nonsense. A lot of people smarter than me or you have looked at this an concluded that the CMB is exactly what is expected of the BB. For one thing how can scattering of light from very w...
- Tue Oct 31, 2006 9:24 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Universe Not Spherical
- Replies: 48
- Views: 15054
I am sorry if you took personal offense but you really have no right to, in Science you have to expect your theories to be looked at dispationately, there will be others far less polite than me I can assure you. You are fortunate you don't have to make polite conversation in person with people that ...
- Sun Oct 29, 2006 4:10 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Universe Not Spherical
- Replies: 48
- Views: 15054
- Fri Oct 27, 2006 11:25 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Colliding Galaxies (APOD 24 Oct 2006)
- Replies: 17
- Views: 5204
Not really you can see that the X-ray data just looks like a smooth blob. The question is whether or not this is due to the gas actually being smooth, or because the intruments resolution is so low it tends to smooth things out. You can see in the bullet cluster that you can't resolve any real bumps...
- Thu Oct 26, 2006 7:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Colliding Galaxies (APOD 24 Oct 2006)
- Replies: 17
- Views: 5204
There are plenty of pictures of the hot gas that surrounds large elliptical galaxies or clusters of galaxies. The problem is that they just don't look very good. The resolution of the instruments used to measure them is so poor you just end up with smooth looking blobs. Though the temperature and de...
- Wed Oct 25, 2006 9:12 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Inner Core of our sun
- Replies: 294
- Views: 48445
There are actually several routes to hydrogen to helium fusion, the pp chain and the CNO cycle being two. The pp chain is the one you describe BMAONE23. In the Sun, this is the dominant route, but in higher mass stars which are hotter enough to create Carbon, Nitrogen and Oxygen this route tends to ...
- Tue Oct 24, 2006 12:02 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Star Formation
- Replies: 121
- Views: 37053
- Tue Oct 24, 2006 11:55 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Origins of the UNIVERSE
- Replies: 829
- Views: 148189
Sure you can Harry, you'll just have to wait a few hundred million years till you can see its motion. Plus its not that galaxies are expanding, space is expanding, anything that is bound (either gravitationally or through some other force) remains the same size, so people, planets, stars, galaxies, ...
- Tue Oct 24, 2006 11:14 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: So.....
- Replies: 6
- Views: 2793
- Mon Oct 23, 2006 1:59 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Star Formation
- Replies: 121
- Views: 37053
- Mon Oct 23, 2006 12:18 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Star Formation
- Replies: 121
- Views: 37053
No it just means that it is entirely compatible with BBT for those stars to from in the time allowed after the BB. From those stars we know the Universe must be at least 9 Gyr old, from GCs we know it must be at least 12-13Gyr old, both of which are compatible with the BBT. All we can infer from thi...
- Mon Oct 23, 2006 10:58 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Star Formation
- Replies: 121
- Views: 37053
Er yes, The the stars the white dwarfs formed from were born 9 Gyr ago, when the Universe was 13.7 - 9 = 4.7 Gyr old. 13.2 Gyr is how far back we can observe, why would you add that to the age of a star? Its like saying I am 55 years old and I have pictures of me that go back 40 years, so I must act...
- Mon Oct 23, 2006 10:52 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Universe Not Spherical
- Replies: 48
- Views: 15054
Hi Harry, I look forward to your input. Hi Confused. There are many things that might have happened, but there is no point discussing things that might have happened when it is so unlikely that they have. There are many good reasons to believe that BHs form from galaxies not the other way around, ju...
- Sun Oct 22, 2006 3:55 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Universe Not Spherical
- Replies: 48
- Views: 15054
Simply put anything is possible. There's a non zero chance that Harrys steady state is correct. However the chances of galaxies being spewed out of BHs is so small that to all intents and purposes we can treat it as an impossibilty, according to everything that is known about physics and has been ob...
- Sun Oct 22, 2006 10:08 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Universe Not Spherical
- Replies: 48
- Views: 15054
Well if you believe GR and QM nothing can escape a BH except energy/mass in the form of Hawking radiation. The important thing that I said is that since there is a black hole at the center of every galaxy, it seems likely that galaxies are born from them in some manner. I don't see how this follows,...
- Sat Oct 21, 2006 9:43 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Universe Not Spherical
- Replies: 48
- Views: 15054
Hi Confused, Its definitely worth having a healthy dose of skepticism, one thing that is important to remember though is that any theories that replace the current ones likely will have to build on those already around. Take gravity for example, GR has been tested to huge precision, so any theory th...
- Thu Oct 19, 2006 12:03 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: NGC 7635: The Bubble Nebula; a question (APOD 18 Oct 2006)
- Replies: 16
- Views: 6954
I think Qev is right, you can see that there is more material piled up towards the NE of the bubble in this image. http://antwrp.gsfc.nasa.gov/apod/image/0511/bubble_croman_big.jpg I guess this is what you would expect if there is more gas in that direction so it takes longer for the ultraviolet pho...
- Thu Oct 19, 2006 10:53 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Crank Theory of the Week
- Replies: 46
- Views: 14803
No Harry I am not, In a scientific discussion, there needs to be some science. If your going to make scientific claims you have to use the scientific method, otherwise you will be ignored. I am happy to discuss any claims, as long as they are back up by some maths or some observations. Anything that...
- Thu Oct 19, 2006 9:24 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Universe Not Spherical
- Replies: 48
- Views: 15054
When they observed 6 Gyrs in deep field. I was told that when we see over 13Gyrs into deep field we shall see the birth of the universe. Than when we did, many cosmologists said ooops we did not expect what we saw. Than it was patch up time for the Big Bangers. Unlikely Harry, the inferred age of t...
- Thu Oct 19, 2006 8:25 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Universe Not Spherical
- Replies: 48
- Views: 15054
Don't worry Confused, Harry has a problem with logic, and stating the obvious. To counter Harrys point about seeing past 13.7Gyr, as far as I know we could now if there was anything to see. If galaxies as bright as those in the nearby Universe exist before 13.7Gyr ago the HST UDF should have seen th...
- Wed Oct 18, 2006 12:17 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Sirius B (APOD 6 Oct 2000)
- Replies: 5
- Views: 3950
I don't think so, in 120 Million years is a very long time, more than enough time for the gas thrown out to be swept away or incorporated into a new generation of stars. The stars will have made about half an orbit of the Milky Way in that time, during the passing through the disc things ususually g...
- Tue Oct 17, 2006 11:00 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Origins of the UNIVERSE
- Replies: 829
- Views: 148189
With regard to Harrys list of 30 problems with the big bang I have previously explained why the first 10 are patently rubbish on page 2 of this very thread. I have since learned much that further backs up my conclusions but omit this now for clarity. The other 20 reasons are also equally poorly thou...
- Tue Oct 17, 2006 10:23 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Origins of the UNIVERSE
- Replies: 829
- Views: 148189
No Hats, but I'd happily eat a sombrero if you are right. Needless to say, I'm not worried. I don't doubt that there will be changes to the overall theory, Dark Energy may go, inflation may be tweaked, but the overaching theory is undoubtedly correct. Your argument here is nonsense, and I suspect yo...