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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
marcus
140 115,197
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 45,698
light can travel light-years of distances.. its a EM wave which needs no medium to travel, but how can it travel for...
T 07:49 PM
phinds
8 1,307
How long before our magnetic field disappeared and how long after that would we be dead due to radiation?
T 06:28 PM
berkeman
14 425
- - -
Let's assume an planet with Earths mass and radius orbits a G2V type star at 1 au. This planet would have an the same...
T 04:40 PM
willstaruss22
13 475
I have a comprehensive list of MK5(SAO) and BD-HD numbers with RA2000, DEC2000, Proper Motions and etc. I want to...
T 03:06 PM
Philosophaie
0 67
I'd like to have two main questions about it. 1. Radiation protection : theoretically, were thick leaded glass...
T 01:59 PM
GTOM
28 1,850
http://i.imgur.com/w9PGgXi.jpg LEDA 074886, also known as PGC 74886, is a dwarf galaxy with a rare rectangular shape,...
T 11:35 AM
Hornbein
2 553
Hi, PF: I'm currently about to graduate from my Ph. D. program in Physics and I want to focus my research in...
T 11:30 AM
Hornbein
2 484
I am writing a paper on the collision of two galaxies. I would like advice on using the right method to complete this...
Y 08:46 PM
c-english
6 728
Let's start off with what we know about blackholes; It is formed through a colossal explosion of a star. So, I want...
Y 08:36 PM
Drakkith
9 410
http://money.cnn.com/2014/09/16/news/companies/nasa-boeing-space-x/?hpt=hp_t2 ...
Y 03:26 PM
Drakkith
2 160
Hi Is someone interested in this topic ? I'd like to share my idea with you, PF people. I also designed a...
Y 03:06 PM
joebox
5 508
I am trying to create a list of stars. I need a comprehensive comparison between: FK5#s, HD#s and BD#s and...
Y 11:06 AM
kjhskj75
3 236
Newton showed that if gravity at a distance R was proportional to 1/R2, then indeed the acceleration g measured at the...
Y 03:39 AM
Bandersnatch
1 237
Hi there, to answer some people believing in astrology, I wanted to know what was the order of magnitude of the...
Y 03:14 AM
Nugatory
1 226
So, this is something that's got me wondering; The CCCP landed crafts on Venus, and more recently, NASA landed the...
Y 12:15 AM
lpetrich
5 491
Why the gravity around a black hole remains normal unless you get extremely close? But first: How far from earth is...
Sep15-14 03:20 AM
Chronos
2 328
Hi everyone. So I got this question in a test, but I'm not exactly sure about the answer. Q: For a planet moving...
Sep13-14 10:10 PM
Creator
4 422
guys and gals if you haven't seen this video of solar flare yet, then hold onto your seats!! make sure you view it...
Sep12-14 05:38 PM
Greg Bernhardt
19 1,761
I have read it in many papers that this is a flux limited sample. But I have trouble in understanding what is the...
Sep11-14 10:41 PM
vociferous
2 479
Gammaray bursts (GRB) may affect the prevalence of life in various different regions of the galaxy....
Sep10-14 02:05 AM
vociferous
2 758
Does anyone believe that the solar system has a second star? There is a theory that the solar system has a second,...
Sep9-14 05:26 PM
Hatshepsut
10 1,371
Hi all. OK so these were shot with the same camera with same settings. Both are supposedly at 28 km altitude in the...
Sep9-14 05:22 PM
davenn
6 678
I previously posted on the idea that the Hawking equations looked wrong:...
Sep9-14 04:28 PM
Drakkith
2 1,087
I'm trying to create a chronological timeline of the formation of solids in the solar system with examples of...
Sep8-14 05:59 PM
connorp
2 476
http://science.nasa.gov/science-news/science-at-nasa/2014/26aug_rosetta/ Landing is expected in mid-November. ...
Sep8-14 04:08 PM
Dotini
2 643
Why haven't we gone back to the moon? Seems like we could save a whole lot of money and time if we were to go back...
Sep8-14 10:17 AM
Drakkith
51 1,935
So magnetism has definite lines of force. Does gravity have an equivalent device. References would be good just...
Sep7-14 01:55 PM
Drakkith
16 762
How do scientists know if something is traveling away from us at any given moment, yes, it might be red, but it could...
Sep7-14 11:37 AM
Nugatory
2 418
Sooo, this is something I'm really happy I figured out, buuuut, I want to make sure it's correct. I guess the...
Sep6-14 06:16 PM
MattRob
0 360
Hello guys, I really hope I came to the right section, since technically my topic involves not only astronomy, but...
Sep6-14 04:49 PM
Drakkith
1 384
Why isn't the dark matter just randomly distributed? How does it know where to go? Why does the amount of dark matter...
Sep6-14 04:37 PM
vociferous
6 529
I just saw this video and wanted to share it. It contains some pretty awesome plots of the motion of galaxies in our...
Sep6-14 12:13 AM
davenn
1 422
What do you all have to say about the concept of multiple universe?
Sep5-14 05:39 PM
phinds
7 588
Look up, there’s space. Astronomically speaking, it’s right there, just outside a thin layer of atmosphere. But how...
Sep5-14 04:59 PM
BobG
3 522
Is the universe my own? I mean the whole of it, because I am the observer. If I was not there to observe it, would it...
Sep5-14 04:02 PM
Evo
7 572
If the galaxies are all moving away at speeds of the big bang "explosion" which was moving at speeds defying physics....
Sep5-14 01:19 AM
Chronos
10 587
I know the universe doesn't expand at a speed but rather a rate over distance but if we take two objects on opposite...
Sep4-14 12:11 PM
Bandersnatch
4 940
The most widely cited figures are 1.4 solar masses and 10 km radius. However, tracing the references back to their...
Sep4-14 09:49 AM
zyxwv99
2 536
I wish to replicate the simulations and values obtained in the following paper but I do not know where to start my...
Sep4-14 02:59 AM
a_potato
2 502

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