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Astronomy & Astrophysics

- Celestial objects, space, and the physical universe as a whole.
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Jan16-12 Greg Bernhardt
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 45,736
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
140 115,298
Hi, I am putting together a scenario for a sci-fi computer game called Aurora and I am after some advice. I am...
Oct10-09 12:10 AM
9 1,178
Is there a median sea level that the logs of sea level data is based? I know the moon causes the tides which upsets...
Oct10-09 05:10 PM
10 1,362
What are the physical possiblities if the ,astroid Toutatis , crosses directly between the moon and Earth on December...
Oct10-09 05:11 PM
14 9,512
first i have to apologize if my question sounds dumb. but i graduated only recently from high school. so my current...
Oct11-09 01:01 AM
4 1,695
Hello everyone this is my first time posting on this website. I wanted to know if our solar system takes a path...
Oct11-09 08:03 PM
13 10,932
My question goes like this: Did the inflation following the Bing Bang caused matter to emerge as it is in our...
Oct13-09 03:33 PM
9 1,151
Hello all, This NASA press release indicated that there is less likely hood of an encounter with the Apophis...
Oct13-09 03:55 PM
4 3,349
Which is more likely to happen for individual events: two elliptical galaxies colliding to form two spiral...
Oct13-09 06:11 PM
5 1,065
Stars twinkle because our atmosphere's turbulence causes these point-like bodies to scintillate, whereas planets...
Oct13-09 07:33 PM
13 1,978
I was wondering, novice that I am, whether there is any theoretical limit to the size of a black hole. I know there...
Oct14-09 02:17 AM
27 3,364
If the proton does not decay, will black dwarfs become iron stars in 10^1500 years>
Oct14-09 04:25 PM
9 1,973
How do magnitude values, specifically B-V and U-B, relate to the surface temperature of stars?
Oct15-09 09:00 AM
0 1,837
I've just been asked of the Earth's eccentricity or orbit changes over time. The idea is that, over a period of...
Oct15-09 02:23 PM
6 5,813
Question> The fact (simplified) is that our planet is rotating arount the Sun, also our solar system is rotating......
Oct16-09 09:41 AM
6 3,238
Hello everyone this is my 1st post and it is to ask for some advice regarding books. I have taken an interest of...
Oct16-09 09:54 AM
1 1,320
What causes mass attraction? Please expalin it so that its easy to understand?
Oct16-09 01:33 PM
6 1,581
Is there a way to estimate the mass of a star using Spectral Class and absolute magnitude? If you can't then what...
Oct16-09 07:40 PM
1 1,472
Could the effect of "Dark Matter" be explained if in the formaul for Gravitational attraction: F = GMm/d^x Where x...
Oct17-09 10:01 AM
7 1,121
What is the difference between axial tilt and inclination? I know that axial tilt is the angle between the...
Oct17-09 03:30 PM
7 6,553
Bertrand's Theorem states that the only stable orbits involve forces of the form k/r^2 or kr. How close does the...
Oct17-09 04:08 PM
0 1,720
I've numbered them so you can just include it in your reply instead of screwing around with tags. STELLAR...
Oct18-09 09:42 AM
51 5,294
I was looking at this link: wikipedia and wondered to myself why the asteroid belt just outside of Mars is a
Oct19-09 05:22 PM
2 2,970
It is 20th October. 1. Does a point on Earth scans through all the twelve Zodiac constellations in 24Hrs? 2. Why...
Oct20-09 05:10 AM
3 4,912
Hi I'm writing a story and I need to figure out what color the sky is on a planet orbiting Zeta Tucanae that has close...
Oct20-09 05:01 PM
2 2,627
I have a question about black holes and energy but have no idea what to do. if someone could just point me in the...
Oct20-09 10:53 PM
1 790
Can there be stars and planets made out of antimatter?
Oct21-09 02:48 AM
24 6,473
Is it correct that the age of a star, such as the sun, is calculated by measuring the amount of helium made from...
Oct21-09 02:55 AM
17 2,938
Hi All, how is the age of universe calculated ? i read a few articles/wiki etc and its estimated to be roughly...
Oct21-09 06:33 AM
4 1,846
Is there more than one meaning for "gravitational shear". It seems to refer to focusing of light beams. When I...
Oct21-09 04:05 PM
1 1,485
If gravitational waves formed interference patterns, or just simply interfere as normal waves, couldn't that result in...
Oct22-09 01:39 PM
27 5,870
What is out there in the universe that shields strong gravitational forces?
Oct22-09 08:51 PM
1 1,674
Ref: Does this constellation appears moving from the Earth's reference? I...
Oct22-09 08:57 PM
11 2,198
I was reading this on wiki: In the stability section, it claimed...
Oct23-09 06:02 AM
1 821
As we everybody know,in this universe, every body is in motion... Then there are no frames of references..Then how...
Oct23-09 04:35 PM
3 944
Say a god got mad and could and did turn off the nuclear fires in our sun. About how long till earth freezes? We...
Oct24-09 03:34 AM
7 1,556
If the Earth rotated faster about its axis, how would the value of gravity change?
Oct24-09 03:48 AM
22 10,685
I was wondering how the distribution of Lyman alpha absorbers (as seen in the "forest" of absorption lines of a quasar...
Oct24-09 03:36 PM
Jonathan Scott
0 903
Imagine a double star with components separated by 10 astronomical units (10 AU). How far away can such a system be...
Oct24-09 07:12 PM
1 915
Put this in the astro forum, since you guys are the most likely to be using this software...please move if that's...
Oct24-09 08:24 PM
1 1,938
Newton's Third Law of Motion: III. For every action there is an equal and opposite reaction. Photons in the sun...
Oct25-09 04:04 AM
2 1,880

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