Search found 144 matches

by rigelan
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...
by rigelan
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...
by rigelan
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

The Close up is pretty cool, it looks like there is this huge chasm though right in the bottom center completely zoomed in.

The swap button works well too. Crossing inward, which most people can do easily hurts my eyes, but the other direction is easy for me.
by rigelan
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

That is one massive image!
by rigelan
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

Even though I can't bring up your image at the moment, I assume that would be a wonderful solution.
by rigelan
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...
by rigelan
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...
by rigelan
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

derek, those are gigantic rivets used for the massive ceiling of the those underdwellers on mars.
by rigelan
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

Yeah, it looks like a camera glitch, but its too huge at that resolution to be so. It kinda excites me to have shafts this deep.

If they were on earth, they would probably be filled with water, and we would fish on the natural springs they exhibit.
by rigelan
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 ...
by rigelan
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...
by rigelan
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

Could be. I'm almost betting there are objects that we are 20Gly away from us that we cannot see. So at any point in time are we the furthest away from ourselves? Out of body?
by rigelan
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...
by rigelan
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 ...
by rigelan
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

Umm. The earth is the center of the universe.
by rigelan
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

umm. . . Lower the effective gravity. . .
by rigelan
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...
by rigelan
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!
by rigelan
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

I wonder what would happen if we found a giant wrench and twisted it off . . . What would be inside?
by rigelan
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...
by rigelan
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 ...
by rigelan
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

I wouldn't think martian atmosphere color would be any different than ours. Its very similar. If it were blue on mars, it would look blue here.
by rigelan
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

ooh, sounds exotic
by rigelan
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...
by rigelan
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

I agree. The long exposure gives it just enough light to make it a stunning night shot.