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Astronomy & Astrophysics

- 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
140 113,646
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 45,069
I hear that the moon is steadily moving away from the earth. Is it due to the suns gravity? Will it eventually go...
Apr6-05 05:04 PM
1 1,182
Does anybody know if it is even possible for a planetary moon to have a moon of its own orbiting it?
Mar23-06 12:48 AM
4 1,846
Hey, so this interest in the galactic rotation anomally I've got. I was reading that, according to GR, black holes...
Sep21-10 12:28 PM
Jonathan Scott
3 2,348
Do man-made solar satellites all have roughly the same orientation of orbit around the sun?
Apr21-04 06:05 PM
2 1,872
Guys! Nice to see physicsforums still seems to be going strong. Lost my interest in physics for a few years but...
Dec29-04 10:49 AM
5 1,605
Hello, I've recently been trying to find out what colour the sun is, but I've had no luck. If you take a look at...
Apr28-12 08:11 AM
7 6,788
The Sun about 4.5 billion years old and in about another billion years will have used up the hydrogen particles in its...
Apr19-14 07:30 AM
3 1,083
I know that Mar's moon's, Phobos and Deimos, do not have enough mass to be round, but does this mean that if an...
Apr19-14 07:35 AM
2 987
Peaks of mountains in Venus are more than that on the Earth Is there any active volcano? Plz tell me about any...
Jun29-12 08:59 PM
8 1,874
Quasars are galaxies which are very active at centre pulsars are dense stars.... Since pulsars rotate very fast it...
Jun24-12 04:12 AM
4 1,168
When I view the Orion Nebula through my telescope it appears a grey (US 'gray') cloud. When I take a time exposure...
Jan8-12 06:09 AM
3 1,643
Hi, Im doing an IB Extended essay on astrophysics, on the planning stage. My aim is to calculate the surface...
Feb28-10 04:19 AM
2 2,036
A few years ago, I worked out a problem considering what gaseous molecules a planetary body could expect to retain or...
Sep26-12 06:12 PM
0 851
I would like to know the difference between dark energy and dark matter. The way i understand it they are both...
Sep29-10 02:19 AM
22 3,937
So i have a physics presentation to do on tuesday and i have no idea how to find the temperature of a of objects in...
Jan20-14 06:25 PM
Simon Bridge
8 1,101
I was just wondering if anyone has ever studyed what a large moon like ours would do to mars? Maybe the tektonic...
May21-04 07:20 PM
Lord Flasheart
7 1,722
Sedna is a recently discovered object in space. Apparently it's composed primarily of ice and similiar elements....
Apr11-04 10:55 PM
8 1,338
Upon reading about the discovery of Sedna and thinking about other objects that may lay beyond Pluto I thought of an...
Apr12-04 09:25 AM
32 2,453
For fun lets assume the following: - I have a box inside which is a device that has the capability of nullifying...
May9-11 08:25 AM
Vanadium 50
28 3,606
What is the maximum wavelength of m101 seen from the Earth by eye?
Sep28-07 08:27 AM
2 2,212
Can an airship rotate the Earth and the Earth is not in eliptical orbit's focus ?(can be in center?)
Oct8-07 10:03 AM
4 1,430
Can someone explain all the known paths a star can take from its birth to its death? This is what I know so far....
Mar13-09 10:02 AM
9 1,644
if a star collapses in its all sides simultaneously, why it become a flat disk later? (as if it crunches to the...
Aug19-09 05:05 PM
meni ohana
6 1,847
Hi! my question is, if space expand, how come the stars (and planets) don't? they are part of the space and not...
May19-10 04:50 PM
2 1,723
Besides low gravity and high doses of radiation, one of the more intractable difficulties in terraforming Mars is that...
Apr14-13 04:24 PM
3 998
From what I've been told, the temperature in space is approx. 3oK if not in direct contact with infrared rays from the...
Dec6-08 08:41 AM
33 3,805
Has anyone else heard about this?
Mar27-03 05:57 PM
6 5,220
I have recently listened to the tapes of the "Journey through the Tenth Dimension" lecture, given by Michio Kaku in...
Apr5-09 11:20 PM
24 4,730
I've just talked with someone who informed me of a T.V. special, that dealt with the discovery of two planets, that...
Mar26-03 08:52 PM
3 2,718
My question pertains to atmosphere. Forgive me if it sounds stupid, or obvious, but I just don't know how atmospheres...
Jun18-03 07:16 AM
Mr. Robin Parsons
14 1,582
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 5,581
I think it's called "Edna"...anyway, it's named after an inuit goddess and it being called the 10th planet of our...
Mar19-04 04:42 PM
2 1,346
Forgive me, but I don't know the source of this. Has anyone heard anything about... ?
Jul27-04 11:40 AM
8 2,332
If blackholes are at the centre of each galaxy is it possible that all the matter from that paricular galaxy came from...
Nov26-06 11:07 AM
MadScientist 1000
24 3,135
I keep hearing about how this exotic Dark Matter is supposed to be evenly spread out across the universe... and that...
Feb9-08 04:01 PM
2 1,308
From everything I have read so far, we only know of Dark matter by means of gravitational inconsistencies. My question...
Jan3-09 09:33 PM
5 1,463
As I was helping my teenage kids with their science homework, I began to wonder if and how Einsteins theories on...
Apr3-09 03:26 PM
9 1,517
I wonder, Why is it so easy to imagine simple ETs, but so difficult to accept God(s) or God ETs as having been here...
Dec7-03 10:44 PM
3 1,068
Could the missing mass/dark matter be (migrating)? Black holes of various sizes? I have serious doubts if the missing...
Aug24-08 07:24 AM
5 1,868
Are there any observations or estimations about asteorids outside our solar system?
May14-11 02:45 PM
6 1,431

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