Search found 144 matches
- Sat Jan 13, 2007 8:52 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Coat Hanger (APOD 12 Jan 2007)
- Replies: 2
- Views: 1813
- Thu Dec 14, 2006 1:38 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: APOD site defaults to yesterday's picture
- Replies: 4
- Views: 2652
- Mon Dec 11, 2006 12:21 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Moon Panorama: shadows, dust, stars? (APOD 10 Dec 2006)
- Replies: 26
- Views: 10156
Imagine the sun directly behind you, warming your neck. Look at the far right side of the picture. (section 4) Keep your body the same direction, but look to the left. The shadows are still facing forward. (Section 3) Turn halfway around, the shadows will face towards you (the middle dark part of th...
- Wed Nov 29, 2006 5:37 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Alpha Cam - Runaway Star (APOD 24 Nov 2006)
- Replies: 13
- Views: 5327
Evidently if the star is compressing the dust in its path, it could be going 60km/s faster than the material around it is. Our Earth on the other hand, rotates together with a bunch of dust that is in our orbit. Even though we are going pretty fast, the dust is too. And so with the sun. Most of the ...
- Sun Oct 08, 2006 7:19 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Darker areas in the oceans, why? Earth Night Picture 1Oct'06
- Replies: 13
- Views: 7668
Could it have to do with the optical density of the oceans? The oceans had a certain brightness, but when it was stretched out to fit that particular earth-projection, that particular part got darker? Or maybe some of the light of the oceans is actually reflections from the light of the moon, in whi...
- Tue Sep 12, 2006 3:28 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Newton's Laws and The Bending of Light
- Replies: 34
- Views: 11553
So wait. . . IF we assume that light has a mass, as newton might (any mass you like, it doesn't matter), then we should know the gravitational potential for the path around the sun or any other star. And if we know the speed of light (I don't know how well this was known before the 20th century), th...
- Tue Sep 12, 2006 3:05 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Newton's Laws and The Bending of Light
- Replies: 34
- Views: 11553
- Tue Sep 12, 2006 3:03 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Newton's Laws and The Bending of Light
- Replies: 34
- Views: 11553
It reminds me of this example: Shoot a proton through an electrically polarized field that is perpendicular to the path of the proton. The proton curves according to the potential of the field. Shoot a neutron through the same field, it has no effect. The proton continues on its path. The potential ...
- Sat Sep 09, 2006 4:45 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Newton's Laws and The Bending of Light
- Replies: 34
- Views: 11553
- Sat Sep 09, 2006 4:42 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Newton's Laws and The Bending of Light
- Replies: 34
- Views: 11553
I didn't know that you could calculate bending of light from newton's gravitational laws. edit: that is unless you assigned light a mass. Did we decide light was massless before or because of Einstein? I don't remember. You could from his optics laws, if you assume there is a slight gas around a sta...
- Sun Sep 03, 2006 4:17 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Pictures of Pluto (APOD 3 Sep 2006)
- Replies: 10
- Views: 4336
It might be because of the apparent width of the objects. Galaxies, even far ones have an decent width (degrees or minutes or even seconds). I'm guessing that the appart width of pluto is just less. This link shows how accurately the hubble telescope can see at different distances. http://sm3a.gsfc....
- Mon Aug 28, 2006 11:35 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Is the Moon a Dwarf Planet now??
- Replies: 2
- Views: 2484
I don't know what the now accepted definition for 'dwarf planet' is, but I assume that it would have to orbit a star as opposed to a planet. That is, there is not an object other than a star that its barycenter (rotational center) resides in. The moon's orbital center resides within Earth, I believe...
- Wed Aug 02, 2006 8:51 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Methane rain possible on Titan (APOD 2 Aug 2006)
- Replies: 12
- Views: 4792
If you want a chemical equation:: (I didn't feel like balancing it) CH4 (methane) + O2 (Oxygen gas) -> CO2 (Carbon Dioxide) + H2O (Water) + Energy If you are missing one of the reactants (CH4 or O2), then you will not get any of the prducts (CO2, H2O, energy) unless you can get them through some oth...
- Tue Jul 25, 2006 3:07 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: East of Antares (APOD 23 Jun 2006)
- Replies: 21
- Views: 7022
- Mon Jul 24, 2006 3:15 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: East of Antares (APOD 23 Jun 2006)
- Replies: 21
- Views: 7022
- Mon Jul 24, 2006 2:41 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: East of Antares (APOD 23 Jun 2006)
- Replies: 21
- Views: 7022
According to Kstars, it is 13 degrees directly east of Antares. (the width of your fist at arms length is around 10 degrees). So add an extra finger :-) It is in the constellation Ophiuchi. Seeing as the width of the picture is around 10 degrees, Just add another full screen to the side, and Antares...
- Thu Jul 20, 2006 6:37 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Constellation Construction (APOD 20 Jul 2006)
- Replies: 7
- Views: 3076
- Sun Jul 16, 2006 2:38 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: manhatten sunset (APOD 12 Jul 2006)
- Replies: 13
- Views: 7830
I do see relevance in this type of post, even though I'm not sure that they mentioned it. Most of the history of astronomy, even the interest of it comes with finding the positions of the stars / sun / moon / planets over the course of the year. The position of the sun does change over the course of...
- Thu Aug 11, 2005 12:58 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: (Aug 9 APOD) Moon ?
- Replies: 8
- Views: 4402