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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
140 114,356
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 45,327
If a black hole will always rip you apart through tidal effects as you approach it, what are the limits on what can be...
Jan11-08 04:36 PM
1 2,485
If you could be there to have a look, what would their color be? How transparent would they be? What would the waves...
Mar4-08 04:16 PM
2 1,588
i've seen many documentaries. most recently nova had one on the expanding universe which prompted me to send them...
May15-11 07:30 AM
4 1,843
Earth’s interior is much hotter than the surrounding environment (i.e., empty space) so there must be a tendency of...
Mar17-09 09:52 AM
20 5,140
Hubble’s law tells us that the velocity of distant objects increases with distance as v = Hr. Does this mean that the...
May14-14 01:41 PM
2 695
Hey all, new to the forum. Had a tough question that I was trying to work out about an orbiting pulsar and the...
Nov3-13 06:38 PM
1 861
I am really interested what are quasars and how do they work.
Apr16-13 11:08 PM
5 1,049
I do have a question that bothers me for some days now. I'm not too sure how qualified it is, but my mind needs to be...
Apr11-10 02:21 PM
4 905 This is pretty suprising to me and I dont...
Jul27-08 09:32 AM
2 1,565
Hello, I am trying to get into amateur astronomy but first I have to understand the sky. Because of the tilt of the...
Feb19-14 02:47 AM
8 1,513
If energy can neither be created or destroyed, why is there supposedly a "heat death" or any sort of death to the...
Apr22-04 05:04 PM
4 1,648
Could Sedna be a trapped rogue planet due to the nature of its distant and highly eccentric orbit? Could a trip to...
Sep3-04 09:57 PM
5 1,890
Is our angular momentum altering our gravitational attraction to the earth so that if the rotation of the Earth was...
Aug12-04 05:34 PM
8 4,274
in some photos, mixed among the red white and blue stars, are green stars. Any idea what causes this?
Oct17-04 11:12 PM
15 3,607
Io is apparently sending dust out from its volcanoes into interplanetary space at great speeds. ...
Sep14-04 05:11 PM
0 1,321 At the above link, it appears there is a high...
Sep27-04 07:43 PM
6 3,859
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 1,185
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 1,852
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 2,360
Do man-made solar satellites all have roughly the same orientation of orbit around the sun?
Apr21-04 06:05 PM
2 1,874
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 1,608
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 6,874
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 1,102
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 1,002
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 1,885
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 1,176
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 1,656
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 2,046
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
0 856
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 3,972
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 1,114
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 1,737
Sedna is a recently discovered object in space. Apparently it's composed primarily of ice and similiar elements....
Apr11-04 10:55 PM
8 1,341
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 2,461
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 3,628
What is the maximum wavelength of m101 seen from the Earth by eye?
Sep28-07 08:27 AM
2 2,219
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 1,431
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 1,654
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 1,851
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 1,729

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