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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
140 106,697
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 43,477
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 2,546
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 2,546
HD 140283, informally nicknamed Methuselah star is a ...subgiant star about 190 light years away from the Earth ...
Jul3-14 05:09 PM
10 2,546
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
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 2,545
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 2,544
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
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 2,544
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
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 2,544
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 2,544
Most ( or probably all?) galaxies are shaped like flat discs (10/30 times wider than thick). Are their planes all...
Jul2-14 08:33 AM
6 2,544
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 2,543
I am curious, last night we had a discussion about the “what if”. Maybe someone on this board can answer. Here is...
Feb4-11 05:36 PM
4 2,542
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 2,542
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 2,542
I originally posted this question in the subsection "Beyond the Standard Model." Unfortunately, nobody replied. ...
Oct2-06 03:37 AM
1 2,541
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 2,541
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 2,539
Hello, PF community. Past wednesday I was visiting the National Astronomical Observatory, which is located pretty...
Oct2-10 04:23 PM
17 2,538
How do we know that the physics we can do in labs here on Earth today is the same physics in galaxies a long time ago...
Oct13-03 04:29 PM
16 2,537
I decided to post a new thread to distinguish from my other post The paradox is as this: suppose that 10 billions...
Dec19-05 12:08 AM
26 2,537
Haven't we been looking at this dead world for three decades now? There are geysers on one of Saturn's smaller moons,...
May1-08 06:09 AM
9 2,537
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 2,537 Magnetic reconnection is the process whereby magnetic field...
Jan24-09 06:39 AM
8 2,536
How is it possible for one planet to rotate opposite the others and one to rotate 90 degrees axially from the others,...
Apr22-10 09:11 AM
4 2,535
Hi, and congratulations to all the PF gurus I have been interested for a long time in AGN unification, and I think...
Apr21-08 03:19 PM
dark matter
15 2,534
...was destroyed by an asteroid which was destined for Earth? Where would that leave Earth? What would happen to Earth...
Oct19-07 08:24 AM
Jonathan Scott
5 2,534
By inspection of the following planetary data (Earth-normalized units), we find that average density (p) scales...
Dec11-08 05:01 AM
Vanadium 50
11 2,533
Sources. Here, Here, and for you forum nazi's Here. :p (just to point out thats a smiley with a tongue out,...
Feb10-12 09:56 PM
15 2,532
Hello, I am a general physicist, pursuing it for fun. I work in solar, and the other day while driving up to...
Jun24-12 07:26 AM
10 2,532
Why do spectroscopic binaries have short periods? I figure it is because they have small separation and p^2=A^3 but...
Jul24-06 06:29 AM
4 2,531
Whenever something interesting happens on the side of the sun that faces earth, is there any orbiting satellite that...
Nov29-06 03:23 PM
RJ Emery
9 2,531
Can we say that Kepler in the early 17th century was the first person to know the distance from the earth to all the...
Jan28-11 12:30 PM
11 2,531
I'm trying to estimate the ratio of the flux of sunlight to moonlight (at full moon). What I'm interested in is if I'm...
Apr17-07 07:55 PM
2 2,530
Hi first post to this forum and my first question might seem pedestrian to you frequent posters and...
May27-11 02:01 PM
7 2,529
While studying a seemingly inconsequential young star and its large planetary debris field, around 300 light years...
Mar6-14 11:45 AM
9 2,529
a supernova can out light a entire galaxy. Ive read it can give out about 10^44J of energy is there anyone of you who...
Aug28-05 03:57 AM
5 2,527
what do they mean when they say "neutrino scalar waves travel back and forwards in time"?and why does it happen for...
Jul18-05 01:07 AM
19 2,526

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