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Astronomy & Astrophysics

- Celestial objects, space, and the physical universe as a whole.
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Jan16-12 Greg Bernhardt
aandc, library, reference Sticky Thread Pinned: A&C reference library ( 1 2 3 ... Last)
Use this topic to post links to helpful/informative websites about astronomy & cosmology.
Jul3-14 06:29 PM
140 115,306
Hellfire requested that I post a list of classic papers that one could use for reference when trying to understand the...
Nov28-12 01:12 AM
17 45,738
Ok so I might sound a bit ignorant, but please bare with me. I have 2 questions 1st I've always wondered how they...
Aug24-13 08:16 PM
10 2,551
So I've been playing with a little N-body code in 3D for gravitational problems and have made an OpenGL visualization...
May17-13 12:17 AM
4 1,073
Couldn't the end of spacetime cause spacetime? As in some sort of looping paradox keeping existence in existence. ...
Jan26-05 05:23 AM
12 2,346
I recently had some thoughts about the big "space" between electrons and the nuclei and how weird it would be if that...
May28-08 08:17 AM
22 3,433
To my understanding, all stars are "born" in nebulas, however, if this is true, why is it that so many stars are so...
Dec8-08 11:29 PM
1 1,355
I have some questions that I have been wondering about for a while. I'm not a physicist, and I don't know the math...
Jul3-10 11:52 AM
8 1,269
Is there a simple-model equation for the radial density of a neutron star, from core to shell? I assume there have...
Feb13-08 12:47 PM
3 4,446
In the movie gravity, there is a scene where Dr. Ryan Stone (Sandra Bullock) detaches herself from the broken but...
Apr19-14 06:32 PM
22 1,656
I need some real good, and quick help. How do you find the mass of a planet with this information? The planet has a...
Jan21-04 09:36 PM
22 6,965
Hi, I know that within the host halo there are smaller subhalos moving around. I was swondering that is their...
Aug2-11 09:57 PM
1 1,985
Please correct me if I am wrong, as I have little more than a highschool knowledge of physics until I start at...
Jan10-12 12:55 AM
16 3,292
There is a developing theory that the Universe may be shaped like a three-torus, the mathematical equivalent of a...
Jun25-03 07:15 PM
2 2,900
Wikipedia says that the core temperature of our Sun is 15.710^6 Kelvins. I don't know what that means in terms of...
Apr14-10 03:48 PM
2 2,182
We are learning about centers of mass now and it made me wonder, does the universe have a center of mass? If so , what...
Oct23-11 04:48 PM
26 5,290
i overheard someone talking about something called the M theory. They mentioned the string theory too (which i know...
Feb9-05 05:26 PM
3 921
Hello! I am looking for a catalog that contains redshift, modulus distance and position (if it is possible) of many...
Apr28-13 09:48 PM
1 958
Hello! Does anyone know how to export coordinates data of supernovae from Aladin to an Excel file? It is possible?...
May23-13 09:30 AM
0 1,494
Something similar to this came up in a lecture but it wasn't explained very well. From wikipedia it seems that our sun...
Mar31-12 09:08 AM
5 3,017
Why does Saturn's dust form a flat ring and not a sphere around it?
Sep23-09 06:07 AM
2 4,760
What is the minimum angular distance from the Sun for Venus to be visible TO THE NAKED EYE?
Mar26-12 10:54 PM
4 2,637
So this weekend I read a little about the Dresden Codex of the Maya (their astronomical log) and played a little bit...
Apr18-12 07:25 PM
3 2,086
I am not so good in astronomy but i had desire to know what was in there right from my childhood. can you please clear...
Dec6-13 07:06 PM
Simon Bridge
3 1,069
Why sun rays are not considerably hot when reaching earth..? is there any specific reason for the sun rays to lose its...
Dec6-13 04:19 AM
Simon Bridge
3 1,143
I had this doubt right from my school days. What is actually gravity? what causes it? is that the core of a planet...
Jan2-14 11:24 PM
21 2,611
Why is earth's path is elliptical?why not circular?
Oct29-09 12:25 AM
8 4,402
Hi! Let's say that astronomers observe some galaxy or something several million lightyears away and then come to...
Dec21-04 05:19 AM
6 1,035
Hello everyone! Can anyone explain why sky is blue? Thanks.
Nov13-09 01:43 PM
3 1,831
I ran across some article that pointed to this research: The theory...
Jun3-08 08:49 AM
18 6,346
Saturn takes about 10 years to go around the Sun once. What is the semi-major axis of Saturn's orbit?
Jun13-10 05:07 PM
4 1,756
This is my first time posting on the forums, so please be nice if I mess up :) My question is this: After matter...
Sep13-11 03:21 AM
6 3,671
okay so i was given this graph and questions and have no clue where to start! any help or tips would be great!!...
Dec1-09 10:47 AM
3 1,218
Hello everyone! I just was reading Your questions and was interested in IAO problems. There are only problems...
Jul14-12 05:09 PM
2 1,107
What is the difference between the float and fly and move freely in space first, and within the earth's atmosphere?
May7-11 04:18 PM
1 1,499
What is the meaning of floatin and flying and moveing freely in space?
May23-11 12:57 AM
7 1,962
If we have two parallel plane in the space in addition to another two objects moving in parallel with the same...
May11-11 06:28 PM
2 1,168
Many times we heard about black holes and other holes differs from one hole to another . assume we have a hole where...
May23-11 08:16 PM
6 1,786
Thank you
May26-12 11:20 AM
2 2,032
Are there other comets like hally (periodic phenomena's?)
May10-12 04:58 PM
4 1,920
Hi everybody I just wanted to ask are all the galaxies in the universe visible by the light they send? In the other...
May6-11 05:24 PM
17 3,572
Does anyone know of a good reference regarding solving the Tolman-Oppenheimer-Volkov equations for neutron stars? Most...
Sep30-06 10:27 AM
3 3,139

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