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General Astronomy

- Celestial objects, space, and the physical universe as a whole. Astrophotography and amateur astronomy are welcome!
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Hi everyone Use this topic for posts about ongoing/upcoming stargazing events (e.g., comets, eclipses,...
Apr14-14 07:08 AM
Borg
282 104,898
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 89,269
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...
Y 01:42 PM
spark802
502 147,492
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 38,709
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 81,068
It is thought that the universe is roughly 14 billion years old (soon) and that all matter came from a singularity...
Feb28-13 06:24 PM
bahamagreen
26 4,566
In Cosmology books and tv programs it is mentioned the galaxies are accelerating and running away from us. My question...
Feb13-13 05:14 PM
cepheid
22 2,178
What do you think is the best type to find planets in the habitabel zone? What do you think of the suggetsion of white...
Feb25-13 02:54 PM
snorkack
16 5,195
The understanding of the origins of our planet (as well as the other planets in the Universe) has always remained a...
Jan18-13 05:19 AM
Chronos
2 2,262
Hello everyone, I was wondering if anyone can explain how the abberation of starlight works in general terms, as well...
Oct19-12 04:31 PM
Pharaoness
3 1,707
Will Earth pass through the galactic plane in 2012?...
Nov15-12 04:21 PM
Jimmy
4 2,606
Voyager spacecraft finds solar system is bigger than thought: ...
Mar4-13 11:29 AM
Velikovsky
1 1,841
My wife, myself and another viewer were watching the Geminid meteor shower at about 2:00 AM on 23 December, 2012. Most...
Feb17-13 10:06 PM
Traz 0
12 2,779
After waiting about 10 days for clear weather last night and this morning I spent several hours testing a new...
Mar4-13 09:53 AM
Velikovsky
5 2,143
So I'm a little confused about what a standard candle tells us exactly. From what I understand, it means that the...
Jan15-13 10:29 PM
Astrofan
3 1,156
how can you use the angle to determine the distance if you don't know the motion of the star itself. is it by...
Jan15-13 09:10 PM
Chronos
3 1,215
This video http://www.youtube.com/watch?v=7Mz2laHjVoQ] explains the mechanism behind aurorae, but i need some...
Mar1-13 06:24 PM
Velikovsky
2 1,399
Check out the University of Arizona's Huygen's Titan Descent Movie Garth
Mar2-13 10:05 AM
Velikovsky
7 1,848
Hey! I'm doing Science Olympiads and my category is Astronomy. We're allowed to bring in a laptop with whatever we...
Mar4-13 06:30 AM
Velikovsky
4 1,576
Good Day Everyone, I am trying to find out the rates at which the inclinations of the Solar System's planets...
Feb15-13 05:38 PM
Redbelly98
1 853
I figured out the answer to the question in the title. The seasons are due to the earths north to south axis facing...
Feb12-13 03:57 PM
jim mcnamara
7 1,465
Hi, Iam thinking of making my own telescope and I have a magnifying glass lens, biconvex, about 10 cm in diameter and...
Feb14-13 09:32 AM
PhysicoRaj
5 582
Hi, I'm 16 years old and I really want to win my national science fair. I'm fascinated by all things space and I...
Feb13-13 07:26 PM
Bobbywhy
5 1,459
Hi!! I am not much of astrophysicist or something but read something about Black hole information paradox in a...
Feb17-13 08:22 AM
phinds
8 1,280
Hi. I have been researching the Earth-Sun analemma and I found this document about deriving the Earth-Sun analemma...
Feb16-13 09:20 AM
Reuel
0 713
From what i understand Io is extreamly active on geologically. So does it also produce plate tectonics?
Feb16-13 11:38 AM
Drakkith
1 1,138
Hey, I'm trying to start learning about astronomy with my brother's old telescope and I need a little help in getting...
Feb18-13 12:28 PM
grobertsx
5 1,297
Lets say Earth as a moon of a gas giant. Lets say it orbited the gas giant the size of Saturn every 24 hours. I...
Feb20-13 01:01 AM
snorkack
7 1,381
This not only goes for water, but any hot, melted substance suddenly exposed to the near vacuum of space. For...
Feb21-13 05:19 PM
marcus
4 1,547
Hi I read up on astronomy for fun and I find the cosmos very fascinating my question is what determines the...
Feb21-13 05:37 PM
Chronos
6 973
Can we see if a planet is inhabited 1 million lightyears away (presently)? No, correct? We we actually be seeing...
Mar2-13 01:25 PM
Velikovsky
12 2,036
I have heard people say there is no center to the expansion of the universe. I have also heard the expansion...
Mar1-13 04:01 PM
Velikovsky
3 1,309
Hi, I was just wondering, why are we only looking for massive compact HALO objects? Can there not be such objects...
Feb26-13 10:29 PM
d3mm
8 985
I have this question posed in my astronomy class; where do sub-storms originate in the Earth's magnetosphere? My...
Feb24-13 03:54 PM
Gspace
0 677
Hello. In my book with examples of astronomy, I found this: Calculate, around which the known celestial bodies in...
Feb26-13 06:50 AM
mfb
2 811
How high is usually the probe above the surface of the cosmic body? It would be best if it was specifically the...
Feb25-13 07:40 AM
Simon Bridge
1 699
First post...Hi everyone. Now that the Chelyabinsk meteor has been determined to be 700,000 tons and 56 feet in...
Feb28-13 06:41 PM
Mamasinham
2 1,308
In my astronomy lab we (part A) calculated how many arc seconds a super nova remnant had expanded from 1942 to 1976,...
Feb27-13 08:12 PM
DLH112
0 487
Hey all, I haven't been alive for that long, so I guess my data probably isn't as good as it should be, but in my...
Feb28-13 12:23 AM
SteamKing
1 830
http://www.washingtonpost.com/national/health-science/van-allen-probes-spy-third-band-of-radiation-before-it-disappears...
Mar1-13 01:10 PM
Greg Bernhardt
3 982
Hiya, First off, I'm not sure where to post this topic. I was thinking either the homework section, or General...
Mar4-13 10:02 PM
Mordred
15 2,131
I'm looking for a more or less definitive answer for the earliest time when rocky planets could form. I saw one...
Mar3-13 05:33 PM
Mordred
10 1,391
As I understand it, the rate at which the universe is expanding is increasing. Can the rate of expansion ever exceed...
Mar6-13 02:49 PM
mathman
2 1,268
Hi, I was wondering if a planet moves up and down as they orbit the Sun due to the differing inclinations of the...
Mar6-13 09:00 AM
ImaLooser
2 1,214
Hi I am trying to figure out if there is call for a small, commercial, educational radio telescope to measure the...
Mar6-13 02:57 PM
Kimmo
0 1,166

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