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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
282 104,505
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 80,526
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
499 146,974
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 88,902
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 38,574
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 1,375
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 2,019
Check out the University of Arizona's Huygen's Titan Descent Movie Garth
Mar2-13 10:05 AM
Velikovsky
7 1,833
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 1,380
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 1,296
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
3 975
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 1,299
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 4,536
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
1 819
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
0 480
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
8 979
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
2 804
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 5,175
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
1 692
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
0 671
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
6 965
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 1,533
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 1,365
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 1,281
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 2,763
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 1,265
From what i understand Io is extreamly active on geologically. So does it also produce plate tectonics?
Feb16-13 11:38 AM
Drakkith
1 1,121
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
0 704
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
1 846
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
5 573
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 1,442
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 2,153
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 1,443
Is it possible to use celestial coordinates which were taken 50 years ago? What kind of inaccuracy can we expect (give...
Feb12-13 01:14 PM
BobG
1 962
If the sun is as hot and dangerous as we assume it is, then why does the planet Mercury still exist? Should it not...
Feb9-13 06:31 PM
Vanadium 50
11 1,760
Hi Guys, This may seem like a stupid question but if the Earth gets hotter the closer to the core you get, then why...
Feb9-13 02:01 PM
Chronos
8 1,354
Probably dumb question. I am trying to understand why the change in day length from day to day is greatest at the...
Feb8-13 11:18 PM
AstroDoug
12 2,276
Hi there. Just been reading about Voyager 1 and it's current progress. Wow. Totally incredible. I mean this is...
Feb8-13 02:02 PM
mfb
17 4,359
http://www.theregister.co.uk/2013/01/08/17_billion_other_earths/ "there are 17 billion other Earths in our galaxy,...
Feb8-13 10:11 AM
mfb
19 2,760
Hello, I have a little three-body (well n-body but let's just worry about 3 now) simulator. I input six Keplerian...
Feb6-13 09:02 AM
lpetrich
4 1,516
Hi all! I didn't know where to put this topic but since I thought it's general for all planets and gravitational...
Feb2-13 01:20 PM
mfb
20 11,543
I learnt on the textbook that human calculated the orbital of planets that near the Earth first then based on the...
Feb2-13 06:34 AM
tinir
2 898
Well, how big things can exist unseen? We did see Pluto - but very importantly managed to not see Eris till very...
Jan29-13 11:48 PM
tony873004
11 2,279
This may be (probably is) a stupid question but in a popular current story in astronomical news, scientists have put...
Jan29-13 03:04 PM
GerdankenDonuts
6 1,317
Hello all, I'm doing an extended project on "the future of radio astronomy". And I would like to know people's...
Jan29-13 12:05 PM
Chronos
3 1,165

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