Search found 121 matches
- Fri Mar 16, 2007 10:50 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Lunar Occultation of Saturn (APOD 16 Mar 2007)
- Replies: 7
- Views: 2891
- Wed Feb 21, 2007 9:37 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Inner Core of our sun
- Replies: 294
- Views: 47518
I fear we have moved into origins of the universe territory again. As John says, the BBT is dead. It has been for 20 years, but it will take a generational change to acknowledge it. I think you'll find that rather than a generational change being needed to get rid of the BBT it is the extreme old gu...
- Sun Feb 18, 2007 12:00 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Black Holes as creators, not destroyers
- Replies: 33
- Views: 12329
- Sat Feb 17, 2007 2:20 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Black Holes as creators, not destroyers
- Replies: 33
- Views: 12329
Harry to re iterate what i've said a thousand times already - there is an overwhelming ammount of evidence for the big bang! -Cosmic Microwave Background -Cosmological Redshift -Observed galaxy evolution -Type 1a supernova distances -Observation that nothing we see is older than the Universe -Nucleo...
- Thu Feb 15, 2007 12:31 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Black Holes as creators, not destroyers
- Replies: 33
- Views: 12329
- Thu Feb 15, 2007 11:36 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Black Holes as creators, not destroyers
- Replies: 33
- Views: 12329
- Fri Feb 09, 2007 9:41 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Inner Core of our sun
- Replies: 294
- Views: 47518
- Fri Jan 26, 2007 12:14 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: How fast can we go?
- Replies: 352
- Views: 80732
- Thu Jan 25, 2007 10:53 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: How fast can we go?
- Replies: 352
- Views: 80732
No Harry, you need to think in terms of special relativity here which is not intuitive. As far as we're concerned light takes a year to travel one light year. However if we were sat on the photon being emitted we would arrive instantaneously at our destination wherever that might be due to length co...
- Thu Jan 25, 2007 10:49 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: How fast can we go?
- Replies: 352
- Views: 80732
Not true Harry, Due to Special Relativity if it was possible to travel arbitrarily close to the speed of light you could pretty much reach anywhere in an arbitrary amount of time. So there is no need to travel faster than light. length contraction L=Lo/y Lo=proper length in object's rest frame (dist...
- Tue Jan 16, 2007 1:26 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Kepler's Supernova Remnant in X-rays (2007 Jan 16)
- Replies: 4
- Views: 2887
- Sun Jan 14, 2007 12:28 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Fast Stars Near the Galactic Center (APOD 14 Jan 2007)
- Replies: 60
- Views: 18589
- Tue Dec 19, 2006 10:28 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Origins of the UNIVERSE
- Replies: 829
- Views: 146578
Astronomers believe the objects are either the first stars -- humongous stars more than 1,000 times the mass of our sun -- or voracious black holes that are consuming gas and spilling out tons of energy. If the objects are stars, then the observed clusters might be the first mini-galaxies containin...
- Mon Dec 18, 2006 10:12 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Inner Core of our sun
- Replies: 294
- Views: 47518
- Sat Dec 16, 2006 11:45 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Inner Core of our sun
- Replies: 294
- Views: 47518
As far as I can tell, the photosphere does absorb most x-ray that try to pass through it . Well the definition of the photoshere is just the point in the solar atmosphere where the opacity drops to a point where you can see the photons emitted from it so the X-rays would be visible from here becaus...
- Fri Dec 15, 2006 10:47 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Inner Core of our sun
- Replies: 294
- Views: 47518
the spectral signatures of neon plasma are seen in X-ray spectra (probably not as obvious in the broad band images you are discussing, in fact the spectra would help see through the coronal loops to the underlying X-ray spectra of the photosphere). So you would see a massive spectral feature for neo...
- Fri Dec 15, 2006 12:03 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Inner Core of our sun
- Replies: 294
- Views: 47518
- Thu Dec 14, 2006 12:25 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Inner Core of our sun
- Replies: 294
- Views: 47518
- Wed Dec 13, 2006 1:52 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Inner Core of our sun
- Replies: 294
- Views: 47518
micheal
http://antwrp.gsfc.nasa.gov/apod/ap061213.html
just interested to know if this has any implications for your theory or not.
cosmo
http://antwrp.gsfc.nasa.gov/apod/ap061213.html
just interested to know if this has any implications for your theory or not.
cosmo
- Mon Dec 11, 2006 10:24 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Origins of the UNIVERSE
- Replies: 829
- Views: 146578
- Sun Dec 10, 2006 2:37 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Origins of the UNIVERSE
- Replies: 829
- Views: 146578
Re: inflation a few posts ago michael and astro were discussing inflation. I was at the RAS on friday and heard an excellent talk on testing inflation. By assuming the only variations in the tiny pre inflation universe are purely quantum (very reasonable at these size scales). we would expect the un...
- Fri Dec 01, 2006 10:50 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Origins of the UNIVERSE
- Replies: 829
- Views: 146578
- Tue Nov 28, 2006 1:54 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Origins of the UNIVERSE
- Replies: 829
- Views: 146578
I would hardly describe it as closed doors. We undertake a lot of public outreach work to let people know what we're up to. However if you don't have a formal education in physics it will be extremely difficult to get your theory across to those who have. Remember Cosmologists aren't stupid we don't...
- Tue Nov 28, 2006 11:43 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Origins of the UNIVERSE
- Replies: 829
- Views: 146578
- Tue Nov 28, 2006 10:56 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Origins of the UNIVERSE
- Replies: 829
- Views: 146578
Harry, as I've said before, I have met many a cosmologist at top research institutions and never found one who disagrees with the Big Bang. I've met a handful who disagree with Dark Matter and many who are uncomfortable with Dark Energy but the Big Bang is one thing we all agree on. I'm aware of the...