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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 45,670
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
140 115,137
I wonder is there a planetoid bigger than pluto in the solar system or is it possible that there could be a planet...
Nov10-10 10:09 AM
6 3,509
I've been reading some books on Galactic Structures and Galactic Evolutions, evidence from rotation curves of stars...
Dec1-03 07:50 AM
5 10,834
I often look up at the sky and wonder how far away this or that star/object is. I know that most discernible stars are...
Nov26-10 06:40 PM
5 2,984
I known the calculation of the YORP effect on an object is quite complex (I have a lot of papers on the subject and...
Jan15-11 08:42 PM
1 733
Currently being reported in the popular press is an interesting-looking missing light crisis. Everybody loves a good...
Jul19-14 08:05 AM
Jonathan Scott
7 3,448
Hi all, Sorry to ask a naive question - I've read that the vacuum energy density (due to quantum fields) is...
Apr17-12 08:58 PM
0 929
When the HST looks out into the far off regions of space, the data it recieves (the light from distant galaxies etc.),...
Sep21-05 06:29 AM
69 12,312
Ok, so I was just thinking about this today. First off, I was thinking about absolute zero, and how they say it's...
Dec1-12 06:05 PM
2 1,751
Perhaps virtually 100% of physicists out there believe that we live in an 'accelerating universe', but as a person...
Nov25-13 01:53 AM
12 2,413
I.e. Was there a universe before the bigbang? Well, i guess so. Hence, there must be an infinite cycle of universe:...
Jan30-12 09:41 AM
Rob D
42 8,843
I am thinking mostly about all that heat released in stellar activity, but any insights about this might help resolve...
Jan24-05 10:43 AM
Les Sleeth
17 2,901
Some physicists have told me that the universe is like the surface of a balloon. Does this mean that if it were...
May12-08 10:26 AM
27 3,311
I am an occasional visitor here, and I hope this is the best place to ask a question please. I have been doing some...
Apr7-09 02:18 AM
12 1,951
Does the universe has boundaries?, is it finite?
Jul8-13 12:46 AM
118 28,848
ok, here it goes: this afternoon, wandering on wikipedia I stumbled accross a 3D projection of a rotating tesseract...
Nov26-12 07:38 AM
9 1,646
Just wondering what the general scientific community thinks about this topic.
Aug15-04 08:17 PM
18 12,458
I'm sorry if I posted this is the wrong section, but I was wondering if fundamental forces evolve? In other words, can...
May17-13 09:14 AM
2 1,193
Oct11-03 11:56 AM
1 2,327
Would the conservation of mass apply to the universe? Sorry I looked for awhile for the answer to this question but I...
Sep20-10 01:26 AM
2 2,603
A simple question. I might ask this as well: Is the universe causal? The reason I'm asking this is that today I've...
Apr14-14 09:51 PM
16 1,723
I am only casually interested in astronomy so its rather difficult for me to articulate my thoughts, but I will try my...
Jul14-12 11:10 AM
3 1,593
Maybe not the correct sub-forum for the question, but is the total amount of water on the planet constant ? I know...
Feb11-14 04:45 PM
15 2,219
And consequently provides zero resistance? Link:
May18-04 01:21 AM
4 1,658
Since nebular theory states that our solar system formed from the gravitational collapse of a giant gas cloud. ...
Jun18-10 06:29 AM
4 4,222
My educated guess is that you can see the sun if you were standing on the moon. Having said that, why isn't there any...
Sep14-12 01:56 AM
36 5,369
is the Sun a sphere (like the Earth) or is it more oval-shaped and elliptical? because, since the Earth is (nearly)...
Jun20-03 11:18 PM
Echo 6 Sierra
4 4,018
Hey everyone. Let me preface this by saying, I love physics and astronomy, but am by no stretch an expert in either...
Sep16-12 11:50 PM
8 1,903
Is the sun actually dying because I have heard a lot of good scientists near where I live say that it is and is not,...
Dec11-08 08:17 PM
30 21,558
By "Is the sun anchored" I am referring to its place relative to the planets. I am pretty sure the answer is yes,...
Feb26-09 04:39 AM
8 1,685
Consider a photon of a certain frequency emitted from a distance slightly greater than the event horizon of a black...
Feb18-11 06:40 PM
5 1,882
Hello everyone! Just something I was thinking about today that I haven't been able to shake. I recently read that...
May5-13 08:52 PM
1 945
Speed of light, (“Constant” contradictions); Electrical...
Mar23-04 12:05 PM
3 4,395
Hello, I have a question about sunspots, to which the answer i could not find using google. Is the solar brightness...
Apr28-10 01:15 PM
8 3,373
What evidence proves that photon emission of an object, - at all sends some of its momentum back to the source, - and...
Nov18-12 11:03 AM
29 4,307
Lammerzahl, Preuss & Dittus' paper Is the physics within the Solar system really understood? claims that the following...
Aug9-09 05:28 PM
7 2,374
Basically, all more distant galaxies have a Red Shift that increases with the distance to the galaxy, the Universe is...
Sep24-12 01:19 AM
2 1,129
There have been a few threads of late on the multiverse concept in cosmology, and whether it can be viewed as a...
Jun18-12 03:27 AM
Ken G
43 5,674
I have always wondered why the moon doesn't look blurred to us if earth is spinning so fast, or are we spinning so...
Jun10-13 08:52 AM
5 2,549
I've mentioned this before, the problems that might arise if the moon were to leave our orbit. However, I never really...
Dec13-03 05:14 PM
15 5,624
The 'measurement' of the radial expansion of the moon's orbit is 3.8 cm/yr...
Jul24-09 04:27 PM
14 4,585

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