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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
282 104,567
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
139 88,963
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
499 147,070
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
17 38,593
We often have questions about what telescope an aspiring amateur astronomer should buy. The "correct" answer can be...
Apr9-14 07:52 AM
234 80,606
Hi All, I am an enthusiast and love the sky... always wanted to develop the hobby to observe the sky, but here in...
Aug24-11 04:04 AM
20 5,353
i just bought a telescope and i am in canada it iz really cold outside and i want to take it outside to look at the...
Jan27-05 07:40 AM
2 744
Good evening, everyone. My name is Steve, I'm 37 and from a small town called Fort Dodge in Iowa (USA). I have no...
Mar30-11 03:27 AM
6 2,687
Hi Can someone explain why orbits are elliptical and not circular? Does elliptical orbits still follow the rules of...
Aug26-09 05:27 PM
15 6,463
I was going to put this up in the homework forum, but I feel the folks down here are more capable of helping me out. ...
May10-10 11:55 PM
5 3,783
Does space plasma explain dark matter? I have read about how Voyager 1 showed that there was different density in...
Oct16-13 04:15 AM
4 1,301
last night i was at the beach with my friends. i was looking up at the sky and i saw a star (two actually) that was...
Jan6-12 06:04 AM
24 20,375
11/23 10:41. the moon is shining through a circular opening in the clouds or something. seriously, the opening is a...
Nov26-04 12:33 AM
8 1,401
has anyone built this, something similar, or know anything about it? i found it on the internet and decided it was...
Mar27-05 04:26 PM
4 1,578
hello. i am taking a planetary astronomy class and at the end there is a final project due. the project is "designing"...
Mar23-05 06:11 PM
10 1,641
i am doing a project on neptune. a main constituent of this project is deciding what you want to investigate...
May3-05 05:35 PM
7 1,821
Ok. Let me start off by saying I don't believe 2012 is the end of everything. :rofl: However, I have heard about this...
Dec2-08 05:28 AM
2 6,875
Would a galaxy 7 billion LY away appear to be twice the expected size (angular size) as a consequence of the expansion...
Apr26-08 12:54 AM
5 3,156
I'm a bit confused because the sun's radiation & heat are passing through space (with some passing through planets'...
Nov15-13 12:05 PM
12 1,605
I've had a Meade DS 114 for a while. My kids dismantled it and apparently a piece is missing. The focuser tube is...
Aug6-08 09:17 AM
7 1,930
I've got a telescope (Meade DS114 -- reflecting, D = 114mm, F= 910mm, f/8) that I'm trying to get together again. We...
Aug6-08 08:53 AM
1 1,597
How long does it take for earth, mars, and Jupiter to line themselves up to a certain separation angle. Background...
Mar12-14 11:59 PM
Simon Bridge
2 777
What is SED? Why is it \nu F(\nu) Why do we need to multiply the flux by the frequency? Many spectrum plots in...
Dec2-09 09:03 PM
0 2,278
Hi All, I am new to this website, I have read allot on this forum without subscribing previously. I have a...
Feb12-14 11:42 AM
7 1,005
I'm sure a lot of you have heard of the warp drive theory. I can't seem to find much on the bubble part, though. In...
Jun12-12 11:51 AM
7 1,866
Hi, I'm interested in learning just how scientific research is done—specifically for Astrophysics. I would like...
Mar30-05 12:33 PM
7 1,778
The plane of the moon's orbit is currently inclined at 5 degrees to the plane of the ecliptic. However, the plane...
Sep26-08 06:37 AM
0 2,850
Could someone explain to me how solar flares occur? How do high incidence of solar flares on the sun's surface affect...
Apr5-05 03:25 AM
3 1,963
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
0 705
Looking at the Friedman solution for a fluid with a given pressure and energy density, we have: H^2 =...
Mar23-05 04:26 PM
Rev Prez
7 1,326
I have heard the term 'subspace' repeated many a time in various science fiction TV shows, Star Trek and Stargate the...
Dec19-04 07:11 PM
4 4,598
Many people, especially layman's would consider this to be a very chaotic event, however, isn't this really not true....
Mar16-11 08:58 PM
5 1,851
What are the differences between these telescopes and which telescope will do more for our understanding of the...
Mar22-14 03:25 PM
4 642
The usual story is that after a solar flair (coronal mass ejection) towards the earth the earth's magnetic field gets...
Apr28-13 07:46 PM
7 1,399
Fan shaped deposits at the south pole have been attributed to CO2 gas geysers: Gas jets spawn dark 'spiders' and...
Sep8-07 03:31 PM
0 2,018
Tell me if this is feasible. Liquid mirrors may cost only 1/100th the cost of a comparable solid mirror: Friday,...
Sep17-07 10:50 AM
1 1,429
Hi, How is a space probe planned to be fail-proof? And how is the trajectory calculated?Is it easy to do or requires...
Dec6-04 06:01 PM
5 3,032
My girlfriend and I want to have a Moonlight rendezvous where we can both see the moon at night at the same time. I'm...
Jan2-13 11:44 AM
jim mcnamara
1 1,338
Hi. A friend of mine, knowing about a probe (actually, 2) going out from the solar system, asked to me if we can...
Nov25-11 08:59 PM
11 3,643
Hi I am looking for the actual meaning of some technical/procedure words in astronomy, like: 1) Follow-up 2)...
Apr15-12 05:21 PM
4 1,426
Hello everyone. I am trying to translate the flux of a source observed by a telescope, in different units. In my...
Nov8-12 10:25 AM
3 1,654
Dear Physicists, First time poster and a complete physics amateur with a serious question. I may not have posted...
Jun1-11 05:18 PM
Cosmo Novice
10 3,367
I was wondering why the magnification of a telescope is not considered negative since it is inverted. I know it...
Dec8-07 04:12 AM
1 1,564
Could there be objects between Mercury and the Sun? Like, say, asteroids?
Aug7-09 01:18 AM
Vanadium 50
1 1,538
I've heard that the moon is very slowly moving away from Earth. Will it eventually escape Earth's orbit?
Dec24-09 07:21 PM
8 16,153

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