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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
140 109,916
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 44,105
Jul8-03 10:30 PM
0 2,560
If somehow a supernova will be redirected to 30, 45, 60, 80, 90 degrees cone, would the blast received be powerful...
Jul7-11 04:56 AM
6 2,559
I know that looking back in space is looking back in time. I also know that seeing the Big Bang should be beyond us in...
Dec8-03 10:03 AM
24 2,558
Why does the moon's orbit move from low in the sky to higher in the sky, then back? I have tried accessing information...
Sep22-11 02:05 PM
7 2,558
Can an infinite universe with infinitesimal detail be nonrepeating?
Feb9-05 03:07 PM
15 2,556
Suppose we have an astronaut orbiting Object X. His feet are tidally locked with it. He is close enough that there is...
May7-11 10:33 PM
11 2,555
Here's the link. I just read an article on MSNBC. I always thought gravity...
May5-03 04:26 PM
Mr. Robin Parsons
31 2,553
Would it be possible for binary planets, or even a planet and it's moon, to simultaneously sustain life? I know the...
Jun6-04 10:51 AM
11 2,553
I can "understand" the gravitational pull of the sun on the earth and the earth mass effect toward the moon, but what...
Nov2-07 05:53 PM
7 2,552
I have a serious question which has been on my mind for awhile. I was thinking about the problem three months ago,...
Dec19-03 01:31 PM
14 2,551
How big can stars be? people have been wrestling with this question for a long time is there a cap on the mass of...
Mar17-05 11:34 AM
Billy T
14 2,551
Hi guys, I'm not to great at physics and all but I want to learn more. I hope you guys can help me in that...
May20-07 09:32 AM
6 2,551 USA Today 12/6/2009: excerpts below: So how is a "quark star" detected ? ...
Apr6-10 04:33 PM
8 2,551
A comet near the sun whose orbit is________ would never be near the sun again is called what? My options are...
Jun28-12 08:24 AM
7 2,551
The Solar System is traveling around 155 miles a Second around the Milky way Galaxy. There are 31,556,926 seconds...
Jul11-06 09:43 AM
10 2,550
I completely understand the effects of parallax as well as perspective...intuitively; but I can't seem to explain them...
Sep23-11 10:09 PM
2 2,550
I remember when i was reading on Einstein's relativity the idea of the universe wrapping around, and not having...
Oct24-05 12:14 PM
Bass Boy
3 2,549
Hi (I hope I'm posting in the right place) In physics class we are currently working with projectories of comets...
Sep20-07 08:00 PM
4 2,549
Hi, This is my first post. If this question is already answered please direct me there. I don't know yet how to...
Dec14-11 05:43 PM
10 2,549
What is being suggeted when it is proposed that space is curved?
Jul21-03 09:33 AM
31 2,548
Does anyone know how much percentage of the total redshift of a quasar is contributed by Gravitational redshift...
Apr28-07 08:05 PM
10 2,548
The preprint on this has not come out yet. What we have is a 5 January blog entry by Sigurdsson....
Jan7-10 03:20 PM
Frame Dragger
9 2,548
As most of you are aware, tidal action between the Earth and Moon is both causing the Earth to slow down in its...
Aug19-03 03:36 PM
I, Brian
24 2,547
The short version: Is it possible to engineer anything useful with black holes in our universe? The long version:...
Apr16-09 02:05 AM
7 2,547
1/2/2012 One new NASA spacecraft is orbiting the moon, another aproaching, to study moon structure via its gravity. ...
Jan12-12 09:38 AM
9 2,547
What is the effect and what is the significance of the frost line that is presently located in the middle of the...
Jan7-11 04:18 AM
2 2,546
I had this doubt right from my school days. What is actually gravity? what causes it? is that the core of a planet...
Jan2-14 11:24 PM
21 2,546
Did anyone else hear about this new development? Apparently if a black hole has a steady influx of matter/energy, it...
Apr9-03 10:58 AM
2 2,545
I read a recently launched space craft is going to pluto and is swinging around jupiter to help it speed up. I dont...
Mar2-06 09:38 PM
21 2,545
If the exploding star that caused the gamma ray burst on Wednesday had occurred as close to us as Alpha Centauri what...
Mar26-08 01:18 PM
12 2,545
Hello, PF community. Past wednesday I was visiting the National Astronomical Observatory, which is located pretty...
Oct2-10 04:23 PM
17 2,545
hi,was the formation of our galaxy inevitable after the BB or could there have been a different outcome, if the former...
Apr7-03 08:34 PM
M. Gaspar
24 2,544
While web-searching for possible breaks between the equivalence of gravitational mss and inertial mass, I bumped into...
Sep8-04 11:50 AM
5 2,544
I have an extremely silly problem I am working on, having to do with celestial mechanics under ridiculous situations,...
Nov30-07 01:39 AM
4 2,544
Hello everyone. I'm working on a video-game that takes place on a distant earth like planet. A key part of the...
Sep15-11 07:53 PM
15 2,544
Hey guys, If something with mass comes close to the speed of light, the laws will adjust and slow down time in...
Mar14-11 01:50 PM
Ken G
11 2,543
While studying a seemingly inconsequential young star and its large planetary debris field, around 300 light years...
Mar6-14 11:45 AM
9 2,543
I'm wondering about the visual appearance of neutron stars up close. Do they continue to emit light like a white...
Mar19-11 10:16 PM
2 2,542
What exactly is life support? Is it somthing on the shuttle or in their suites? Is it just somthing to recreat the...
Jan28-08 01:02 PM
11 2,540
I teach a semester-long Astronomy elective for juniors and seniors at an independent college preparatory high school. ...
Mar16-11 11:27 PM
0 2,540

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