Search found 20 matches
- Mon Mar 27, 2006 5:52 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Eta Carinae Fatal pulse (APOD 26 Mar 2006)
- Replies: 103
- Views: 39609
Martin, The disappearance of surface water and the atmosphere on Mars is *not* mysterious. A combination of low gravity and weak magnetic field results in molecules in the atmosphere being constantly 'sputtered' into space by the solar wind. Whatever surface water there was would evaporate (or surfa...
- Fri Mar 17, 2006 11:17 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Ring of stars at 7 o-clock from the Galaxie
- Replies: 6
- Views: 3760
I'm sure the ring of stars is a coincidence. It would be simple (for astrophysicists) to determine if it is lensing: the spectra of all the stars in the asterism would be identical. I'm sure if any astrophysicist ever thought that lensing was a possibility, a check would have been done long ago, and...
- Wed Mar 15, 2006 5:41 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Picture of the Day - Mar. 15th - No picture
- Replies: 2
- Views: 1912
- Tue Mar 14, 2006 7:01 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Errors in text of "Globular Cluster M3 from WIYN"
- Replies: 11
- Views: 4927
- Mon Mar 13, 2006 9:04 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Errors in text of "Globular Cluster M3 from WIYN"
- Replies: 11
- Views: 4927
- Sun Mar 12, 2006 7:48 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Errors in text of "Globular Cluster M3 from WIYN"
- Replies: 11
- Views: 4927
- Fri Mar 10, 2006 6:44 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Enceladus HOH = Old News
- Replies: 7
- Views: 3632
But, HelenW, consider: If you were to take several water molecules from Enceladus, concatenate them, use a suitable enzyme to excise duplicates, sever a bit of the tail, then use a clever device to chop it up... HOHHOHHOH HOHOHOH HOHOHO HO HO HO! So, maybe it's just that JPL believes that *there is ...
- Fri Mar 10, 2006 6:18 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: That iceberg depicted is not part of an Antarctic ice sheet.
- Replies: 2
- Views: 1901
- Thu Mar 02, 2006 1:34 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Multiverses, March 1, 2006
- Replies: 32
- Views: 9948
Re: Well...
All science is theory until proven. To not ponder, is to not achieve. The point is, marges90, any 'multiverse theory' *cannot* be tested, hence it *cannot* be proven. This kind of 'pondering' will achieve exactly nothing. People have every right to theorize anything; astrologers have every right to...
- Wed Mar 01, 2006 5:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Multiverses, March 1, 2006
- Replies: 32
- Views: 9948
This stuff belongs on some mystic page, not APOD! It goes right along with such heady stuff as the long-running theological debate 'how many angels can fit on the head of a pin?' All 'parallel universe' theories are absolutely untestable, and hence unverifiable, and hence have nothing whatsoever to ...
- Wed Feb 22, 2006 8:27 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Supernova Remnant and Shock Wave
- Replies: 4
- Views: 3517
Thanks, kovil... you're right, I read it wrong. I was looking for a pinpoint source within the inset, not the larger field. After I cleaned my glasses I could clearly see the pinpoint source (ie, the neuton star) near the top left corner of the Chandra close-up inset. Also, the pre-existing interste...
- Fri Feb 17, 2006 8:17 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Supernova Remnant and Shock Wave
- Replies: 4
- Views: 3517
Maybe! Not only do I not see a jaguar or tiger, but I don't see the Virgin Mary or Elvis, either! I find the description of this image to be very confusing. It would help my understanding of the image if someone were to provide some labeling. A few questions: - Is the whole 'cloud' the supernova rem...
- Wed Feb 08, 2006 6:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: UB 313: Larger than Pluto
- Replies: 15
- Views: 6310
I expect more of the moderator than this nonsense. Like I'm the one who makes pictures. I would actually use this kind of stuff to make those pictures. Nobody has said, or even implied, that you *made* the picture, makc. But who *chose* the picture for use in APOD, and was it a *good* choice? [/list]
- Tue Feb 07, 2006 5:00 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: UB 313: Larger than Pluto
- Replies: 15
- Views: 6310
- Tue Jan 31, 2006 6:17 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Expanding Light Echoes of SN 1987A
- Replies: 17
- Views: 5183
- Mon Jan 30, 2006 9:38 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Expanding Light Echoes of SN 1987A
- Replies: 17
- Views: 5183
I don't think the 'hourglass' explanation works. Yes, it can result in multiple circles, but in order for such circles to appear in a 'target' pattern, the axis of the hourglass would have to be pointing directly at the earth ...which is extremely unlikely. why? it's really big universe. so that nu...
- Mon Jan 30, 2006 9:24 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Expanding Light Echoes of SN 1987A
- Replies: 17
- Views: 5183
I don't think the 'hourglass' explanation works. Yes, it can result in multiple circles, but in order for such circles to appear in a 'target' pattern, the axis of the hourglass would have to be pointing directly at the earth ...which is extremely unlikely. And the other posited explanation -- back ...
- Thu Jan 26, 2006 10:03 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Expanding Light Echoes of SN 1987A
- Replies: 17
- Views: 5183
Thanks for all the links, Harry... I looked at each and every one. A single (not a binary or a triple) star's planetary nebula is roughly spherical. I'm wondering if this star went through several cycles of casting off its outer layers, forming a set of nested spheres. Then, when it went supernova, ...
- Thu Jan 26, 2006 3:49 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Expanding Light Echoes of SN 1987A
- Replies: 17
- Views: 5183
Hi Wolf, Thanks for the reply... but no 'cold one' yet! If you project a sphere of some thickness (like a bubble with a thick membrane) on a plane, you would get a ring, most dense at the 'edge' of the sphere (as we see it), and less dense as you move toward the center, with the lowest density at th...
- Wed Jan 25, 2006 6:10 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Expanding Light Echoes of SN 1987A
- Replies: 17
- Views: 5183
The Expanding Light Echoes of SN 1987A
I don't understand the 'target' appearance of the reflecting light echos. Why doesn't the reflecting echo appear as a *single* expanding ring?