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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
282 104,536
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 80,573
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
499 147,014
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 88,931
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 38,585
We have a good handle on what other galaxies look like, given that we're looking at them from a distance. But when I...
Y 11:44 PM
Drakkith
5 209
guys and gals if you haven't seen this video of solar flare yet, then hold onto your seats!! make sure you view it...
Y 06:19 AM
Jonathan Scott
15 765
- - -
I'm trying to get a basic understanding of Earth's origins in order to teach an advanced oceanography course to high...
Apr15-14 10:47 AM
DHF
9 784
The heliocentric model marked the beginning of modern astronomy. But what were the reasons which led Copernicus to...
Apr15-14 01:09 AM
maajdl
13 474
A simple question. I might ask this as well: Is the universe causal? The reason I'm asking this is that today I've...
Apr14-14 09:51 PM
Drakkith
16 1,033
Your conjectures are greatly appreciated. ...
Apr13-14 04:40 PM
MBob
6 763
The Andromeda galaxy is hurtling towards us at 250,000 mph, in relation to what? Speed here on earth is generally...
Apr10-14 11:54 PM
Bandersnatch
8 513
I'm trying to get a basic understanding of Earth's origins in order to teach an advanced oceanography course to high...
Apr10-14 03:47 PM
curious_ocean
6 510
Why do many claim the universe as a cold place? If it is the natural phenomena then how does formation of stars take...
Apr10-14 12:35 AM
Chronos
6 550
The following article contains several NASA photographs of light apparently emanating outward from the surface of Mars...
Apr9-14 05:42 AM
Dotini
1 713
On an intuitive level, Why do stars show absorption lines? For example, the 121.6nm photon is produced when an...
Apr6-14 11:02 PM
Ken G
5 650
all stars die... this is a given... will we be advanced enough to accurately predict the death of our sun to a...
Apr5-14 07:02 PM
Ken G
5 812
I came across the following claim: Observable Universe Volume ~ 4.077 10^32 cubic light-years Whole Finite...
Apr5-14 06:05 PM
Ripley
1 506
I'd like to know how much of the visible universe we've physically explored. Either with space probes, rovers or in...
Apr5-14 04:01 PM
Bandersnatch
1 539
Hi everyone, I want to discuss the following question: What would happen to the distance between two objects...
Apr4-14 09:21 AM
D H
8 689
Gas from another galaxy is hitting our own, triggering the birth of bright new stars and adding fresh luster to the...
Apr4-14 09:14 AM
CygnusX-1
0 519
Hello, I was just curious why do all of the planets in the solar system orbit in approximately the same plane? Why...
Apr4-14 12:33 AM
Drakkith
18 26,279
What is the lower mass limit for a body to have rings? I'm thinking that Chariklo, at 155 miles in diameter is...
Apr1-14 05:57 PM
mfb
8 867
I read a post here on PF about angular diameter, http://www.physicsforums.com/showthread.php?t=91704 I *THINK* I...
Mar31-14 04:02 PM
mfb
1 451
Would you expect to find stars being made more easily in a cool, high-dense nebula or conversely a hot, high-dense...
Mar31-14 02:04 PM
Sastronaut
8 535
Hello, I'm just doing some research on how life on Earth started (for my own reasons) and I seen that a theory was we...
Mar30-14 08:06 PM
Drakkith
4 695
Hey, does anyone know what software is used on the astrophysics videos made by NASA? Or similar modeling software...
Mar28-14 05:14 PM
rmfw
4 580
My Son is in 5th Grade and currently his class is studying the solar system. he wanted to know why only Gas giants...
Mar28-14 06:46 AM
Damo ET
18 1,111
I realize that some people may still be sensitive concerning Pluto's declassification as a "planet" by the IAU. ...
Mar27-14 04:23 AM
|Glitch|
5 650
Hey everyone. My name is Ryan, I am a filmmaker and am not trained in science past high school. I am making a...
Mar27-14 03:40 AM
georgir
10 7,097
What are the future space missions that you're excited about? (sorry if this thread exists already). I can't wait...
Mar26-14 01:10 PM
enosis_
5 594
http://webcache.googleusercontent.com/search?q=cache%3Ahttp%3A%2F%2Fwww.wral.com%2Fdiscovery-an-asteroid-with-rings%2F1...
Mar26-14 10:02 AM
Dotini
2 773
Hello, I am working in an experiment proposal for a contest at CERN, and I need reliable data about the Polar Aurora....
Mar26-14 07:35 AM
|Glitch|
5 602
Thank you for anything you can offer. We've got a plasma globe which we can tie in to talking about solar and...
Mar25-14 12:33 PM
RocketSci5KN
11 617
The Open Astronomy Journal, published as part of Bentham OPEN. From the website:
Mar25-14 12:31 AM
EyeSeeTee
20 5,132
For example, can spectroscopy replace measurements of stars made by parallax? And ultimately can Hubble's law...
Mar24-14 07:27 PM
ianchristie
5 564
i did a search for juno flyby here and did not find anything, hence this post: i've not been able to find any info...
Mar23-14 10:46 PM
Cosmobrain
5 1,396
hi all just got back from a trip to New Zealand. Whilst at Christchurch City Airport, I was pleased to snap a few...
Mar23-14 01:28 PM
Cosmobrain
10 2,273
Hi. thanks for the pretty place. i want to ask: can atoms move from place to place without passing the space...
Mar23-14 01:46 AM
Drakkith
1 701
What are the differences between these telescopes and which telescope will do more for our understanding of the...
Mar22-14 03:25 PM
Chronos
4 633
I was wondering about how much of the night sky one could see from various locations on the Earth. At any one time,...
Mar22-14 06:55 AM
Damo ET
9 971
Hi! first of all i want to apologize if i have any grammar mistake (english is not my native language). I really...
Mar22-14 05:23 AM
SteamKing
1 589
Found: The Fastest-Approaching Object in the Universe by Dr. Ken Croswell Most of the universe is rushing away...
Mar21-14 11:45 PM
Romulo Binuya
8 1,951
How likely is it that Europa has life under its icy surface IF there is a liquid ocean. Would the ocean on Europa be...
Mar21-14 12:59 PM
Cosmobrain
15 1,951

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