Search found 144 matches
- Sun Jun 17, 2007 9:35 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Analemma (APOD 17 June 2007)
- Replies: 4
- Views: 2506
Solar noon is defined by the highest position of the sun on any particular day. But whether that is due south every day of the year (for those of us north of the tropic of cancer of course) I am not sure. I am guessing it could form the analemma too. But my instinct says that it probably is always d...
- Sat Jun 09, 2007 4:24 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: globular cluster (APOD 09 June 2007)
- Replies: 7
- Views: 3462
There is a video in this forum that shows a globular cluster in computer simulation. It is quite intriguing and leads me to believe there is nothing in the center of a globular cluster except for stars. http://asterisk.apod.com/viewtopic.php?t=11554 I think it was posted by QEV about halfway down th...
- Thu Jun 07, 2007 5:16 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: '3D Full Moon' (APOD 02 June 2007)
- Replies: 6
- Views: 3296
- Thu Jun 07, 2007 12:11 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: A Hole in Mars (APOD 28 May 2007)
- Replies: 109
- Views: 36903
- Wed Jun 06, 2007 1:21 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: '3D Full Moon' (APOD 02 June 2007)
- Replies: 6
- Views: 3296
- Wed Jun 06, 2007 1:20 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: A Hole in Mars (APOD 28 May 2007)
- Replies: 109
- Views: 36903
Of course there are random artifacts, but those artifacts should be generally random. If you do look at the image, there are areas of shade. There is the lighter black at the top, and the deeper black in the center. I would venture to say that those two specific areas generally describe the actual t...
- Sun Jun 03, 2007 8:25 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: '3D Full Moon' (APOD 02 June 2007)
- Replies: 6
- Views: 3296
the crossing eye method is all that I can do. If you purposly cross your eyes inward, it will invert the depth perception, and it hurts my eyes. But if you cross your eyes, focusing them slightly further than your monitor, splaying them outward, the depth perception is accurate, and looks pretty coo...
- Sun Jun 03, 2007 3:43 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: A Hole in Mars (APOD 28 May 2007)
- Replies: 109
- Views: 36903
- Mon May 28, 2007 8:45 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: A Hole in Mars (APOD 28 May 2007)
- Replies: 109
- Views: 36903
- Mon May 21, 2007 11:38 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: M81, galaxy spin direction? (APOD 27 April 2007)
- Replies: 14
- Views: 5613
If neutrinos have a spin, that spin has a vector which is compared to the velocity vector of the neutrino. But if you don't define the spin with regard to an observer or with regard to a single direction, you cannot get any real numerical data out of it. Of course, defining the direction is child's ...
- Fri May 18, 2007 3:56 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: How close to each other are the stars? (APOD 17 May 2007)
- Replies: 6
- Views: 3346
http://zebu.uoregon.edu/~imamura/123/lecture-2/bulge.html I found that the average star density in our area of the milky way is about one star every 5 light years, or one star every 125 cubic light years. This equals 0.008 stars per cubic light year. In the central bulge of the milky way there are o...
- Tue May 15, 2007 3:44 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Where is Earth located within the Universe?
- Replies: 19
- Views: 11029
- Sun May 13, 2007 9:00 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Where is Earth located within the Universe?
- Replies: 19
- Views: 11029
Hey I found a couple images on the distribution of quasars, see if these are any good. http://www.ioffe.rssi.ru/astro/QC/notebook.htm And I think the furthest quasars that we can see are 13.7 GLY away, hence our estimate for the age of the universe. One note about the pictures: There seems to be a l...
- Sun May 13, 2007 8:45 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Where is Earth located within the Universe?
- Replies: 19
- Views: 11029
Aye, but those objects that are 20Gly from each other won't be able to see each other. http://curious.astro.cornell.edu/question.php?number=387 And the limit of the speed of light isn't relative to spacetime. It is only useful when comparing how fast one one object APPEARS to a second object. If an ...
- Fri May 04, 2007 4:02 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Where is Earth located within the Universe?
- Replies: 19
- Views: 11029
- Sun Apr 29, 2007 4:29 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Gliese 581 and the habitable zone (APOD 26 Apr 2007)
- Replies: 22
- Views: 9616
- Thu Apr 19, 2007 1:10 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Water Claimed in Evaporating Planet HD 209458b (17 Apr 2007)
- Replies: 5
- Views: 2297
Ok, so even if it has quite a bit of water, and quite a bit of water is (probably) still on the planet, How much water are we really seeing? I am imagine we just need to compare the strength of the frequencies associated with the absorption of light in water with the strength of the rest of the ligh...
- Mon Apr 16, 2007 4:41 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Red Square Nebula (APOD 16 April 2007)
- Replies: 25
- Views: 15784
Red Square Nebula (APOD 16 April 2007)
That red square.
Wow, what a brilliant oddity!
Wow, what a brilliant oddity!
- Wed Apr 11, 2007 10:46 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Why is polar cloud mysterious? (APOD 03 Apr 2007)
- Replies: 10
- Views: 4110
- Sun Mar 11, 2007 5:32 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Einstein Cross Gravitational Lens (APOD 11 Mar 2007)
- Replies: 18
- Views: 7695
About the lensing. . . I wonder if the galaxy will lens specific wavelengths differently. Do all images of the quasar, from radio signals to Xrays achieve this so-called cross shape? I realize that the theory states that it is the gravitational field that causes the lensing, so the gravitation field...
- Sun Mar 11, 2007 5:24 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: The Einstein Cross Gravitational Lens (APOD 11 Mar 2007)
- Replies: 18
- Views: 7695
I hadn't thought of that. So this could be a possible solution as to why we end up seeing a cross shape (four distinct images of the quasar) instead of a ring of light as the quasar is lensed around the galaxy? And why it is lensed at four distinct angles instead of every angle. I haven't looked at ...
- Sat Feb 24, 2007 3:35 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: White Ridges on Mars (APOD 20 Feb 2007)
- Replies: 20
- Views: 7293
- Thu Feb 22, 2007 12:07 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: White Ridges on Mars (APOD 20 Feb 2007)
- Replies: 20
- Views: 7293
- Wed Feb 21, 2007 3:34 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: White Ridges on Mars (APOD 20 Feb 2007)
- Replies: 20
- Views: 7293
personally, i'm having trouble visually decifering the large dark/light line running just above the middle. Is it a shadow because of the ridge? And if it is, what has been done to the photo to make it difficult to interpret? Hey, does anybody know if this was taken in the visual spectrum? ( as oppo...
- Sat Feb 03, 2007 4:27 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Iranian mountains (APOD 3 Feb 2007)
- Replies: 1
- Views: 1679