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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 38,588
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.
Apr10-13 11:08 AM
marcus
139 88,957
astrophotography, photos Sticky Thread Pinned: Astrophotography photos ( 1 2 3 ... Last)
Looking for advice? Willing to share your expertise with other PF members? Brave enough to share & discuss your...
Dec12-13 08:47 PM
Astronomus
499 147,063
We often have questions about what telescope an aspiring amateur astronomer should buy. The "correct" answer can be...
Apr9-14 07:52 AM
DHF
234 80,595
Hi everyone Use this topic for posts about ongoing/upcoming stargazing events (e.g., comets, eclipses,...
Apr14-14 07:08 AM
Borg
282 104,560
I'm sure a lot of you have heard of the warp drive theory. I can't seem to find much on the bubble part, though. In...
Jun12-12 11:51 AM
DrStupid
7 1,866
Hi I've been meaning to find a correction method for the true location of the sun so when I add the correction to the...
Jun12-12 11:57 AM
hipparchos
8 3,710
Well, i just need help in this confusing part of a star's life. First of all, when the sun finishes the H-fuel at...
Jun12-12 07:49 PM
iced199
3 1,729
If you were to concentrate enough of it in one place, could it generate an antigravity field, similar to the...
Jun12-12 07:59 PM
Pengwuino
1 1,761
From my rather weak understanding of nuclear fusion in stars, four hydrogen atoms are combined into one helium atom....
Jun13-12 05:10 PM
mfb
6 1,834
I was thinking, when we see headlines about new galaxy found to be oldest yet, or furthest away.... is it possible...
Jun14-12 10:55 AM
Simon Bridge
13 1,833
Well, i've seen in almost all sites and books that Red Giants are more luminous than the star itself... Particularly,...
Jun15-12 07:13 PM
qraal
4 1,728
After reading "The Five Ages of the Universe" by Greg Laughlin and Fred Adams, I wondered, if all matter composed of...
Jun15-12 11:34 PM
IsometricPion
7 2,668
In one of the standard candle methodologies, it is given in my book that by looking at the EM spectrum , we can know...
Jun16-12 01:37 AM
Chronos
3 1,233
If during a solar eclipse the moon tapers one moon diameter, wouldn't a lunar eclipse taper one earth diameter?
Jun16-12 11:24 PM
samona
2 1,435
To a close time, i settled my interpretation of expansion of the SUn... When the H=fuel in the core is over, the...
Jun17-12 02:35 AM
qraal
4 1,376
It is closer to Sun than the distance between Sirius A and B. Yes I know that the Sun wound't expand so much to...
Jun17-12 02:55 AM
qraal
4 2,074
I'm new to this forum but... Is our universe a Spec or not? I hope it isn't can you guys provide proof? It has...
Jun17-12 03:46 PM
Integral
5 2,284
Well, I've commented on others' questions on a number of occasions, but something just occurred which has thrown me...
Jun19-12 03:12 AM
NeuronsAtWork
15 2,337
Hello everyone. I am trying to calculate the focal points of the ellipse traced by a planet in orbit around a star,...
Jun19-12 01:09 PM
CarlosMarti12
0 1,096
guys im quite interesting when some people talk about flat geometry universe they also relate this to spatially...
Jun20-12 08:50 AM
Naty1
3 1,659
Forgive me, for i do not have any degrees in physics.:shy: If 1 large object like a planet were to orbit near another...
Jun20-12 03:31 PM
vociferous
7 2,024
Hi! I was just wondering if anyone knows where I can find a software/algorithm that can give me the postion of the...
Jun21-12 08:30 AM
phyzguy
3 2,274
I'm doing a summer internship and my supervisor is currently away and uncontactable. He left me details of certain...
Jun21-12 09:17 AM
Peb63
2 1,049
"New results from NASA's Interstellar Boundary Explorer (IBEX) reveal that the bow shock, widely accepted by...
Jun21-12 10:27 AM
Storm89
7 1,772
We "see" distant objects as they were , sometimes, very, very, long time ago. I assume these images are all in the...
Jun22-12 03:10 PM
BadBrain
15 2,808
Quasars are galaxies which are very active at centre pulsars are dense stars.... Since pulsars rotate very fast it...
Jun24-12 04:12 AM
Mehrdad1
4 1,085
Now that other solar systems have been discovered, as well as binary and trinary star systems, is the helio-geocentric...
Jun25-12 08:48 AM
tiny-tim
23 2,681
If we calculate Birth of Time then T= 0 or T ≠ 0. If Big Bang cause time then should we consider Big Bang time T =...
Jun25-12 12:41 PM
Chronos
2 1,319
Hi all Currently, Voyager 1 is about 120 AU from the Sun. I wonder how big (or small) and bright would the Sun be...
Jun27-12 07:17 PM
Dickfore
5 2,322
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
Integral
7 2,339
Hello i got a list already (Which cost me a good amount of money!) But after buying it i analyzed and get that its...
Jun29-12 01:55 AM
Chronos
1 1,007
The frequency of supernovas in our galaxy is about one per century. Has there been a supernova in the Andromeda Galaxy...
Jun29-12 05:03 AM
Drakkith
4 1,881
I was just reading up about Halley's Comet in Wikipedia ( http://en.wikipedia.org/wiki/Halley's_Comet ), and I came...
Jun29-12 04:21 PM
BadBrain
2 1,403
I cant get my dsi pro II to produce a live view image. I either get a black screen or a grey screen with pepper dots....
Jun29-12 05:37 PM
Chronos
10 1,240
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
davenn
8 1,710
I have red that as an object approaches a black hole, to an observer the object never appears to pass the event...
Jul2-12 08:08 AM
Naty1
4 1,218
Are they really black? And are they really holes? I'd say they are actually neither. Would I be right?
Jul2-12 04:34 PM
Alex1
16 2,160
I've just seen tonight's episode of "Through the Wormhole with Morgan Freeman", which dealt with empty space and the...
Jul2-12 06:44 PM
BadBrain
15 2,798
If proton decay does not occur, will neutron stars just last for eternity unless something collides with them?
Jul3-12 01:11 PM
lpetrich
9 2,283
Apparantly this one was missed, at least nothing turned up on a search. Obviously you can speculate all you...
Jul6-12 02:12 PM
D H
25 3,458
I've thought about dark matter and I'm wondering if it could possible be made up invisible bouond states of ordinary...
Jul7-12 07:39 AM
ZapperZ
1 2,135
anyone read this article about latest relevation about dark matter? any thoughts? ...
Jul9-12 03:58 PM
SpaceTiger
3 1,750
I have to preface my questions by saying that I have only a little better than a high school understanding of physics;...
Jul10-12 12:52 AM
bioinfinity
7 2,966
How strong is the influence of dark matter typically at the periphery (50.000 LY away from the center) for example in...
Jul10-12 01:30 PM
mfb
1 1,248

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