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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
stargazer3
17 43,360
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
marcus
140 106,100
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
Gerinski
4 1,731
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
PAllen
7 1,907
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
phinds
3 1,280
If so, how??
Sep25-13 08:31 PM
Drakkith
2 1,794
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
pervect
1 1,856
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
D H
6 1,311
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
cristo
2 5,657
Dark matter was introduced in order to make General Relativity (GR) compatible 1. with the rotational speed of...
May1-12 02:09 PM
Dotini
7 1,732
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
Phobos
8 1,288
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
PhysDrew
23 4,089
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
Labguy
9 4,722
It is, according to this article on Space.com. http://www.space.com/businesstechnology/050708_teleportation.html ...
Jul21-05 10:39 PM
Danger
31 6,261
http://en.wikipedia.org/wiki/Sudarsky_extrasolar_planet_classification Several astrobiologists I know aren't aware...
Aug20-11 07:43 PM
Nik_2213
1 2,967
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
junglist
10 1,698
Is spin of earth constant during year ? (don't implant friction(s) )
May14-09 04:26 PM
D H
4 4,103
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
Peeter
3 1,366
is spacetime not the same as space and time ?? please explain what's the difference between "spacetime" and, space...
Nov15-12 09:44 PM
ImaLooser
4 1,038
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
DreadyPhysics
4 1,899
It seems unlikely that space time is a lattice because it contradicts the fundamental assumptions and theories in...
May28-04 11:23 AM
Mike2
8 1,569
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
russ_watters
42 19,164
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
ZapperZ
20 3,383
If gravity distorts space-time, does space-time return to equilibrium when the gravity mass is gone (let's say it...
Feb16-12 09:26 AM
Helios
5 2,690
If there is no atmosphere in space, than how could a rocket ship fire it's blasters on the way to the moon? Therefore...
Apr10-10 01:13 AM
Matterwave
7 1,886
I have heard it said that although the temperature of space (NEO) is very cold, the vacuum is actually an insulator...
Dec20-10 02:23 AM
dotancohen
14 5,260
Could what we're looking at in space already be magnified, but we just don't realize it? I can take an ordinary...
Sep3-06 12:03 AM
varsha
6 1,225
I doubt it. The trajectory of meteor was very close to be horizontal, so it could make revolution('s) around the earth...
Feb16-13 04:10 AM
micromass
10 591
... beyond our solar system ... A lot of attention is given to the latest discoveries in the far reaches of the...
Apr13-04 02:00 PM
Andre
14 2,376
Because I was curious about this, I read here that, "Our own Sun is part of an open cluster than includes other nearby...
Apr1-11 11:13 AM
Vanadium 50
5 6,843
Any thoughts on this, fellas? I have not read the book nor viewed the documentary (narrated by James Earl Jones) but...
Oct1-05 10:46 PM
SpaceTiger
1 9,201
What do we know about the atom? All we know is that it has mass and that mass is energy. We know that when you smash...
Sep29-09 08:29 PM
russ_watters
10 7,048
Ok, this may be a silly question and I probably should have asked it a long time ago.. Do the planets in our solar...
Jun12-08 07:13 PM
Lanka
9 5,235
To form, is it one of the oldest?
Jun24-05 03:13 PM
Phobos
6 1,709
Is our galaxy in the centre of the universe? If it is not, how can the age of galaxies be determined? how can data...
Dec17-04 07:00 PM
Chronos
4 4,635
Is nasa doing anything to advance the science of cosmology? my personal veiw is that this agency is a total waste of...
May18-06 04:21 PM
Michael Mozina
26 2,699
is mysore university good for integrated msc in astrophysics or any other????
Oct21-10 09:50 AM
shrinidhi
0 922
I'm trying to get an expression for how many stars below a certain magnitude m I will see in the entire field of view...
Mar17-11 08:12 PM
Ken G
7 1,623
Does moon have anything good to us, other than for ancient people to imagine a lot of myths about it!:wink:
Jul18-03 03:36 PM
Simfish
13 5,070
I often hear that for planet to have life on it it must have proportionaly large moon to keep it's axial tilt small...
May27-12 11:13 AM
mfb
15 3,300
Consider a star of mass m at a distance r form the center of a circular disk galaxy. Newton's law: F = GM(r)m/(r^2)...
Apr3-10 03:25 AM
FrankPlanck
2 949
Is new matter still being created from energy in the universe anywhere, or is that something that only happened at the...
Aug27-10 07:16 AM
fatra2
5 3,125

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