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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
282 104,736
We often have questions about what telescope an aspiring amateur astronomer should buy. The "correct" answer can be...
Apr9-14 07:52 AM
234 80,840
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
499 147,282
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
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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
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Moons of Saturn have always been mysterious. The Iapetus equatorial ridge is now seen as exogenic, according to these...
T 05:51 AM
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In the movie gravity, there is a scene where Dr. Ryan Stone (Sandra Bullock) detaches herself from the broken but...
Y 06:32 PM
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There is no edge of the Universe. Alright, I kinda realize this, I'm not a layman. However, nobody addresses what...
Y 09:19 AM
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I know that Mar's moon's, Phobos and Deimos, do not have enough mass to be round, but does this mean that if an...
Y 07:35 AM
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The Sun about 4.5 billion years old and in about another billion years will have used up the hydrogen particles in its...
Y 07:30 AM
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Cassini has recently witnessed a bright bump at the edge of Saturn's rings, indicating the formation of a probable...
Y 05:21 AM
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I have a project due where I need to observe a gas cloud, a star system, and a galaxy, and I have to write about what...
Apr18-14 04:51 PM
3 404
I'm trying to get a basic understanding of Earth's origins in order to teach an advanced oceanography course to high...
Apr18-14 03:41 PM
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First discovery of double star that brightens during eclipse Einstein's general theory of relativity explains the...
Apr18-14 01:05 PM
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Apr18-14 09:28 AM
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sir i am taking part in the google science fair with my own design of worlds biggest telescope. my design is given...
Apr18-14 07:15 AM
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We have a good handle on what other galaxies look like, given that we're looking at them from a distance. But when I...
Apr16-14 11:44 PM
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guys and gals if you haven't seen this video of solar flare yet, then hold onto your seats!! make sure you view it...
Apr16-14 06:19 AM
Jonathan Scott
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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
9 927
The heliocentric model marked the beginning of modern astronomy. But what were the reasons which led Copernicus to...
Apr15-14 01:09 AM
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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
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Your conjectures are greatly appreciated. ...
Apr13-14 04:40 PM
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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
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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
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The following article contains several NASA photographs of light apparently emanating outward from the surface of Mars...
Apr9-14 05:42 AM
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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
5 688
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
5 857
I came across the following claim: Observable Universe Volume ~ 4.077 ◊ 10^32 cubic light-years Whole Finite...
Apr5-14 06:05 PM
1 552
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
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Hi everyone, I want to discuss the following question: What would happen to the distance between two objects...
Apr4-14 09:21 AM
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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
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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
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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
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I read a post here on PF about angular diameter, I *THINK* I...
Mar31-14 04:02 PM
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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
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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
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Hey, does anyone know what software is used on the astrophysics videos made by NASA? Or similar modeling software...
Mar28-14 05:14 PM
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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 1,184
I realize that some people may still be sensitive concerning Pluto's declassification as a "planet" by the IAU. ...
Mar27-14 04:23 AM
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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
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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
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Mar26-14 10:02 AM
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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
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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
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The Open Astronomy Journal, published as part of Bentham OPEN. From the website:
Mar25-14 12:31 AM
20 5,225

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