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- 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
140 114,092
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 45,238
please help me to solve this problem: Mars has a mean density less than the mean density of the Earth's mantle. How...
Nov23-11 07:04 PM
1 2,408
When a massive star dies, you either get a neutron star, or a black hole. From my lecture, neutron star are...
Nov23-11 02:22 AM
5 2,738
So I was watching this: which talks about the winding paradox of spiral...
Nov22-11 10:12 PM
Said Harbieh
6 3,508
And directly related to that: How can we be sure of the speed of light? I've been searching for a good answer as to...
Nov22-11 05:30 PM
2 1,419
Hi, This is more complicated the more I consider all the variables. Klein defines a mineral as: A mineral is...
Nov22-11 03:16 AM
Said Harbieh
7 4,062
Can anyone tell me that how many dimensions are there in a black hole and which are the dimension
Nov22-11 02:24 AM
55 7,909
At a distance of 2-4 AUs, (in the asteroid belt), would you be able to stare directly at the sun? What about the rest...
Nov21-11 11:24 PM
7 3,075
hi experts i know stellar evolution but how planet like earth is formed and how it has heavy elements does it is the...
Nov21-11 10:32 PM
Said Harbieh
2 1,949
Recently, I have read a old book with an article about two kids arguing the problem of Sun. One day, Confucius...
Nov21-11 06:17 PM
Raul Lai
5 2,794
Neutron stars are thought to be rotating in a way that their beems are seen as the pulses. The beems are not aligned...
Nov21-11 11:32 AM
2 1,897
How much do we know about the singularity? It's properties, size, weight? I understand it contained all the matter...
Nov21-11 07:32 AM
2 1,548
Question: Why does the Sun and all of the planets except Mercury rotate in the same direction?
Nov21-11 07:22 AM
6 3,839
There aren't any electrons on a neutron star right? They all get squooshed into the protons to make the neutrons. Am I...
Nov21-11 06:46 AM
4 1,938
Extra Giant Planet May Have Dwelled in Our Solar System...
Nov20-11 11:06 AM
6 2,072
Just like the title says - with the meteor passing close by the Earth, gravity should alter the meteor's course. So...
Nov19-11 04:41 PM
24 5,913
In the following web page with imbedded video, play and stop the video at the 30 second mark (the video is about 1/3...
Nov18-11 04:33 PM
8 2,120
what are the consequences of earth if our sun had somehow disappeared? can someone prove how long daylight on earth...
Nov17-11 05:41 PM
30 9,127
Hi, I have a conceptual and mathematical question about gases in stars. The information we have from stars is due...
Nov16-11 11:28 AM
Ken G
3 2,961
There are a number of moons that seem to excite astrobiologists. Europa, Titan and Enceledus spring to mind. Are...
Nov16-11 10:06 AM
3 2,000
Can anyone tell me the basics of Quasar? Note: Means that how it is created when there is only one dimension exists...
Nov14-11 06:56 PM
26 5,079
Can anyone direct me to some instructions that will tell me how I might be able to spot it? I know it may be difficult...
Nov14-11 04:38 AM
42 6,302
Can a variable star become a non variable one? Or viceversa, can a non variable, as it is (almost) the sun, become...
Nov13-11 03:09 AM
6 2,365
Hi, I recently stumbled upon this picture and I've absolutely loved it: ...
Nov12-11 08:50 PM
0 1,079
On 11th December 1972, almost 40 years ago, man set foot on the moon for the last time. The Apollo 17 mission...
Nov12-11 06:13 PM
48 8,612
so planets orbit around a star and satellites orbit around a planet, is there any physical limitations that disallow...
Nov12-11 08:11 AM
12 2,974
Hi I read in a paper that the enrgy saving in taking a payload to geostaionary orbit with a space elevator is...
Nov11-11 11:36 AM
19 3,910
I would like to know how many stars are within 150 light years of Earth. There must be a website somewhere that has...
Nov11-11 06:38 AM
4 3,891
Have you ever experienced the wonder of the night sky? If yes, then you know that the universe has so much to offer...
Nov10-11 11:48 PM
1 2,212
Briefly into the big bang, matter anti-matter annihilation which lead to an excess of matter that is what is our...
Nov10-11 04:02 PM
4 1,974
Nov10-11 09:47 AM
13 4,041
I understand that, given Earth's distance from the Sun and it's atmospheric pressure, it is possible for liquid water...
Nov10-11 03:32 AM
3 2,987
I've recently taken a spectral image (visible wavelengths) of Jupiter. After calibrating my spectral analysis program...
Nov9-11 04:46 PM
1 2,300
Nov9-11 02:29 PM
0 2,401
it takes many years to see the change of arms of a galaxy. so how was the rotation of arms measured?
Nov8-11 10:50 AM
4 1,768
Hey guys, just wondering really how feasible you think Nemesis theory is? For those of you not familiar with it; ...
Nov7-11 03:12 PM
5 2,990
Hi, I have a question/doubt/general-lack-of-understanding here: I have a simulated solar system here, with...
Nov7-11 10:45 AM
7 2,157
Hi everyone, i'm looking for a website that can show me how the solar system was in place the minute i was born....
Nov7-11 03:51 AM
11 4,328
as mass is converted to energy in stars, is universe losing total mass?
Nov7-11 03:13 AM
1 2,132
I would be thankful to you, if you tell me which book do you consider to be best, on the subject of cosmology, for: ...
Nov5-11 09:12 PM
4 13,057
My understanding is that if for example one object is orbiting another, then the mass center of the two masses is...
Nov5-11 06:07 PM
11 3,444

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