Search found 14 matches
- Tue Oct 04, 2005 10:18 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: cats eye
- Replies: 33
- Views: 11657
I could cos it's not right.... :twisted: Empeda, dear, I wouldn't keep trying if I were you. What little of what davecorsby says that is at all intelligible is also wildly incorrect. davecorsby, your inquisitive nature is refreshing, but you might really want to check some of your facts before list...
- Mon Aug 29, 2005 3:35 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Origin of the "big bang" ??
- Replies: 7
- Views: 3665
- Tue Aug 02, 2005 9:05 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Spherical Planetary Nebula Abell 39 (2005 Jul 28)
- Replies: 13
- Views: 82122
Not sure as to why it is spherical, but a great many of these faint PN's exhibit a similar structure, they are faint because they are very large and spread out, hence it's fairly logical to assume they are at a very advanced stage (old!) maybe by this time in the PN's existence the expansion has ev...
- Thu Jul 21, 2005 12:18 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Earth, Solar System and Milkyway Galaxy
- Replies: 15
- Views: 8222
- Thu Jul 21, 2005 12:01 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Supernova in M51
- Replies: 3
- Views: 2391
You also might want to take a look here:
http://asterisk.apod.com/viewtopic.php?t=602
where the author of the image has posted.
http://asterisk.apod.com/viewtopic.php?t=602
where the author of the image has posted.
- Wed Jul 20, 2005 11:56 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Supernova in M51
- Replies: 3
- Views: 2391
- Thu Jun 30, 2005 12:05 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD 20050628 - "false colour"
- Replies: 3
- Views: 3776
- Fri Jun 17, 2005 7:22 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: CMBR Dipole
- Replies: 30
- Views: 18075
- Thu Jun 16, 2005 6:18 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Suggust locations near NYC so I can view the night sky
- Replies: 1
- Views: 3913
The Amateur Astronomers Association of New York holds several observing nights a year in and around NYC. http://www.aaa.org While some of their sights are still fairly light-polluted, they make regular trips out to Bear Mountain and several other places out on Long Island and Upstate NY. Check out t...
- Thu Jun 16, 2005 6:07 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD of June 15, 2005, Cassiopeia A
- Replies: 6
- Views: 3334
- Thu Jun 16, 2005 6:04 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD of June 15, 2005, Cassiopeia A
- Replies: 6
- Views: 3334
I think what you both might be forgetting is that light echoes of this nature are one of those precious few three-dimensional phenomena that we can observe from Earth. The dust beginning to glow that gives the appearance of rapid expansion is distributed all around the remnant in every direction. So...
- Thu Jun 16, 2005 5:44 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: CMBR Dipole
- Replies: 30
- Views: 18075
Therefore, I would like to see a metric in non-comoving coords, but I can't find it anywhere. I'd be surprised if you could find it. In classical mechanics, how many times do you find it is easier to describe a system in spherical coordinates instead of Cartesian? Fairly often, I'd suspect, unless ...
- Wed Jun 15, 2005 10:35 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD of June 15, 2005, Cassiopeia A
- Replies: 6
- Views: 3334
Re: APOD of June 15, 2005, Cassiopeia A
If the supernova occurred 325 years ago, why doesn't the size of Cassiopeia A as measured by the glow caused by the main shock span 650 light years instead of 125? Even supernova ejecta do not move at the speed of light, hence there would be no reason to think the remnant should span anything near ...
- Wed Jun 15, 2005 10:13 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: CMBR Dipole
- Replies: 30
- Views: 18075