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- Celestial objects, space, and the physical universe as a whole. Astrophotography and amateur astronomy are welcome!
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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 89,313
Hi everyone Use this topic for posts about ongoing/upcoming stargazing events (e.g., comets, eclipses,...
Apr14-14 07:08 AM
282 104,944
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...
Apr22-14 01:42 PM
502 147,563
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 38,722
We often have questions about what telescope an aspiring amateur astronomer should buy. The "correct" answer can be...
Apr9-14 07:52 AM
234 81,132
Im trying to solve back for Jupiters effect on the suns orbital velocity. Ive looked up the asnwer and its 12.7 m/s...
Mar17-11 10:03 AM
2 1,981
I found an interesting explanation for rotational speed of the galaxies in the below link at section 7.1 ...
Apr17-07 09:39 AM
5 1,396
If a solar eclipse is visible near the equatorial region on the Earth, does it move from West to East at about 1000...
Aug24-10 06:51 PM
1 1,595
Any suggestions on vendors for good, well-designed reflecting telescope mirror holding cells, in the ~ 8" diameter...
Aug31-11 06:19 PM
8 3,148
Back in the old celestial mechanics forum, I wrote about a simulation in GravitySimulator where I created a moon with...
Feb14-06 09:05 PM
0 1,316
We have lift off. ...
Nov19-05 03:37 PM
4 1,632
Venus currently does not have a magnetic field. I have come across one source that says the rotation plays a part in...
Dec3-09 04:36 PM
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photos here: next time, 2117...YOU won't be here to see it then!! ...
Jun8-12 07:58 AM
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Dec11-03 03:11 PM
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Apparantly this one was missed, at least nothing turned up on a search. Obviously you can speculate all you...
Jul6-12 02:12 PM
25 3,486
Jun8-04 11:42 PM
Nommos Prime (Dogon)
0 1,154
This came up in another thread, and now I'm not sure of my answers. 1] Venus' rotation is retrograde. Is that...
May7-06 11:53 PM
8 1,882
I am working with the Keplerian Elements from the JPL web site. a - Semi-Major Axis e - Eccentricity I -...
Jun7-10 02:18 AM
0 1,571
Hipparcus indicates that our supposed closest star alpha centuari is 742 marcs parallax, which corresponds to about...
May21-11 01:32 PM
2 1,987
Um im new to the forms i am an eight grade I am on the natinol honor role I am in algbra 1 i have won the science fair...
Oct15-03 09:40 AM
1 1,369
Does anyone know what the native resolution of Cassini's various cameras are? I'm looking for VERY high resolution (>...
Jan30-06 12:15 AM
2 4,548
wFpeM3fxJoQ VLT (Very Large Telescope)
Aug28-11 10:17 PM
2 1,886
why do stars twinkle? (or why do they look like they're twinkling?)
Apr11-04 09:51 PM
5 1,479
If something hit the Earth billions of years ago and caused a molten blob to be released from it,and this blob settled...
Feb27-07 10:46 AM
7 3,635
Anyone know of a good 10-20 minute video on space travel? Anything that provides sufficient information on space...
Apr28-10 09:39 PM
3 1,254
At a distance of 2-4 AUs, (in the asteroid belt), would you be able to stare directly at the sun? What about the rest...
Nov21-11 11:24 PM
7 2,714
When we view the Milky Way with the naked eye from earth in the winter night sky, we see the streakish 'cloud' of its...
Mar22-07 09:01 PM
8 12,136
Before reading this article please read the following: NEVER view the sun with the naked eye for any length of...
Nov7-11 04:37 AM
1 1,929
How it is possible to capture photographs of milky way. I mean just take a case that we can't take photos of earth...
Nov3-10 05:49 AM
3 1,520
Hello I am not quite sure what resolution i am suppose to see if i look through saturn in my Orion 6" newtonian...
Mar23-09 05:37 AM
24 9,329
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 3,160
I live in Oregon on the coast, so not only do clouds get in the way, but so does light pollution (though im sure light...
Nov18-10 11:51 AM
7 3,287
Hey Im looking to buy a fine quality telescope by either Meade or Celestron, a schimdt Cassegrain. I came across this...
Jul28-05 04:57 PM
11 2,265
Hi all, I have a question according to Vilenkin's proposal using GR one borrows the notion that geomerty is not...
Jun23-05 06:25 PM
2 1,422
The universe is infinite so that means that there are an infinite number of planets. Some of these planets are known...
May27-03 11:05 AM
5 1,414
Hope this is the right forum.. What does the community think of Branson's Virgin Galactic? Will it be nothing more...
Nov3-11 03:40 AM
7 2,377 Does VIRGOHI21 Pose a Problem for MOND? Scott Funkhouser, Occidental College,...
Mar12-05 12:52 AM
6 1,745
Was there an early epoch when all particles were virtual - perhaps before the Planck time?
Sep27-05 02:17 AM
1 1,775
Are you too lazy, or cheap, to buy a decent telescope, set it up and cruise the night sky? But would still like to...
Jun22-05 06:14 AM
4 1,422
I was thinking... virtual particle-antiparticle pairs created just inside the event horizon of the universe...
Dec15-04 01:46 PM
4 1,972
I re-read parts of "Genius" by James Gleick earlier today after visiting a web-site that discussed steady-state...
May29-04 06:51 PM
8 1,845
Was wondering: In Hawkins's " Univers in a nutshell" book, he talks about the behavior ov virtual particule pairs...
Mar10-10 04:00 PM
10 2,218
To members of the forum interested in astronomy: Just went to the Starry Night website and my Avast software detected...
Jun6-11 07:48 PM
0 1,914
So this weekend I read a little about the Dresden Codex of the Maya (their astronomical log) and played a little bit...
Apr18-12 07:25 PM
3 1,908
There may have been other threads, wondering about the mystery of Venus. Or to sum up: ...
Sep29-05 01:26 PM
6 3,382

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