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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 45,199
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
140 114,012
Since nebular theory states that our solar system formed from the gravitational collapse of a giant gas cloud. ...
Jun18-10 06:29 AM
4 4,195
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 5,311
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 3,976
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 1,871
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 21,490
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 1,674
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 1,864
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
1 931
Speed of light, (“Constant” contradictions); Electrical...
Mar23-04 12:05 PM
3 4,380
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 3,356
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 4,210
Lammerzahl, Preuss & Dittus' paper Is the physics within the Solar system really understood? claims that the following...
Aug9-09 05:28 PM
7 2,361
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 1,120
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 5,618
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 2,514
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 5,588
The 'measurement' of the radial expansion of the moon's orbit is 3.8 cm/yr...
Jul24-09 04:27 PM
14 4,554
I saw on t.v. that the moon's distance to earth as measured by lasers reflecting off of the mirrors left on the moon...
Aug8-09 12:36 PM
Bob S
6 1,485
And if so, at a rate faster or slower or the same compared to at earlier times of the universe?
Sep26-13 02:52 PM
13 6,085
Where is the matter of black holes? It seems the matter which ever formed or fell into a black hole, is somehow still...
Sep29-04 05:37 PM
4 1,807
It is known since Hawking that an observer "a rest" at some far distance of a black hole sees a thermal radiation...
Mar28-12 05:03 PM
7 1,963
I have recently read a few things about the local interstellar clouds and while I am by no means a science expert,...
Jan10-13 01:31 PM
3 1,300
If so, how??
Sep25-13 08:31 PM
2 1,910
cause the universe is expanding so it s doing work is increasing and the total Q energy in the universe is constant so...
Oct20-05 03:45 PM
1 1,866
Is the experiment to find water on Mars by NASA is most idiotic experiment ever conducted by mankind. I mean,...
Jul29-13 08:41 AM
6 1,376
If we can see equally far in every direction, which I believe is true, then that makes the earth the centre of the...
Apr30-08 02:59 AM
2 5,702
Dark matter was introduced in order to make General Relativity (GR) compatible 1. with the rotational speed of...
May1-12 02:09 PM
7 1,768
This has been bugging me for some time and I'd love to get a clearer picture. We know that photos from the various...
Sep28-04 01:56 PM
8 1,314
i.e something happening out of nothing or was there no birth at all and all that exists today existed since forever?
Nov22-10 04:29 PM
23 4,155
Is the Andromeda Galaxy going to collide with the Milky Way? I've heard that the Andromeda Galaxy is going to...
Feb18-05 11:29 PM
9 4,825
It is, according to this article on ...
Jul21-05 10:39 PM
31 6,290 Several astrobiologists I know aren't aware...
Aug20-11 07:43 PM
1 3,200
Hi, Is to possible to have an orbit (say around the sun) where the planet (say the earth) would be slightly tilted...
Jun20-08 02:54 AM
10 1,720
Is spin of earth constant during year ? (don't implant friction(s) )
May14-09 04:26 PM
4 4,190
At one time it was thought(still is?) that we live in a closed universe? So if we live in a closed universe we...
Apr26-09 02:05 PM
3 1,375
is spacetime not the same as space and time ?? please explain what's the difference between "spacetime" and, space...
Nov15-12 09:44 PM
4 1,055
Hey Einstein said that space, time and energy are linked. On a program at discovery science, they said that he got...
Sep30-10 11:23 AM
4 1,920
It seems unlikely that space time is a lattice because it contradicts the fundamental assumptions and theories in...
May28-04 11:23 AM
8 1,592
This brought me to the question: How can space expand? Does it mean that i can push off the vacuum? Is space some kind...
Mar24-07 06:15 PM
42 19,423
obviously in some points, their is dust and little objects but is space itself really nothing? Not matter, not made of...
Jul5-12 04:33 AM
20 3,489

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