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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
marcus
139 88,967
Hi everyone Use this topic for posts about ongoing/upcoming stargazing events (e.g., comets, eclipses,...
Apr14-14 07:08 AM
Borg
282 104,577
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
499 147,078
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 38,595
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 80,612
what is the difference between antimatter sun and a matter one, thanks.
Jan31-11 07:40 PM
lpetrich
17 4,115
Referring to following link, it provides satellite location on W135, I would like to know what difference on Satellite...
Nov28-12 07:47 PM
junk0
7 1,367
hi, i have a quick question.....last april (04/24/11 1:22am/est to be exact) i witnessed a flash in the sky, small but...
Apr9-12 09:33 AM
Filip Larsen
5 1,651
I'm going to be around some astronaunts and aerospace engineers tomarrow. Also maybe some astrophysicists. Does...
Apr7-04 05:27 PM
PRodQuanta
8 1,074
Ok well I have a meade 2114 atts relfector telescope and it is great. I can see jupiter and all sorts of other...
Aug21-05 03:56 AM
Chronos
3 1,236
Are there examples of globular clusters (of stars) or clusters/superclusters (of galaxies) that are rotating around...
Jan8-08 11:10 PM
smallphi
0 1,495
Also, is there something to look for in particular when you're buying binoculars for stargazing?
Feb4-11 11:46 AM
turbo
4 1,668
My son is interested in Astronomy (I may have a little interest also). Anyway, I am going to buy him a telescope, but...
Aug5-04 12:40 AM
whydoyouwanttoknow
9 1,667
I saw a thread on ison but it was inactive for days.So i have decided to make one.So here are latest pics of ison from...
Nov29-13 09:12 PM
nil1996
10 1,152
My girlfriend bought me some sweet astro-binoculars from Orion for Christmas (20x80s) and I would love to use them but...
Mar14-08 04:04 PM
turbo
6 3,629
Hi all, I'm trying to find information on this one mission (NASA AFAIK)... They deployed a satellite which had...
May2-03 05:28 PM
marcus
4 1,597
Hi there, I am using a celestron C11. But I really need some help with aligning it up through auto 3 star align. ...
Mar16-07 05:50 AM
EIRE2003
4 2,061
a bit random to this but could any of you give me an example aperture for a telescope collecting ISO far-infrared...
May11-12 11:03 AM
Quagz
9 1,133
i know the equation for both, apogee=a(1+e) perigee=a(1-e). i know the e stands for eccentricity, but what does the a...
Jan11-05 09:20 AM
neiliam
2 6,922
This is sort of in response to an article Ivan posted in the locked Apophis thread:...
Apr18-08 08:10 PM
D H
5 2,211
This is probably the third time that I have heard or read conflicting reports on this. ...
Apr17-08 12:42 AM
Ivan Seeking
54 17,703
Hi everybody, Recently, i have read several articles about Apophis, an asteroid which may hit the earth in about 36...
Feb23-07 05:41 PM
russ_watters
1 2,535
What is the meaning of: "the apparent magnitude of a star is obtain with a system of 3 stars"? Thanks
May17-07 12:34 PM
physicsatiztech
3 1,958
Hello everyone, I've been wondering if I can calculate the apparent magnitude of The Moon since I know the apparent...
Nov24-13 05:10 PM
phyzguy
1 831
I've seen that Mars' apparent magnitude varies between -2.9 and 1.8 and Mercury's from -2.0 and 5.5 (wikipedia said so...
Jan27-08 07:55 PM
pixel01
2 8,279
I know there there has to be a simple answer to this, but I can't understand where it's at. Here is the question. ...
Sep12-13 11:31 AM
snorkack
3 1,074
I am having trouble understanding this problem. It has several parts describing a binary star system. The last part...
Sep30-08 04:24 PM
tiny-tim
1 1,940
Hello everybody! I read that because of about 4 min difference between sidereal day and solar day, at the end of a...
Sep11-13 02:21 AM
Drakkith
1 924
I've gotten into an amusing discussion with another individual on the topic of the apparent size of comets as seen in...
Oct30-12 09:52 PM
Ostsol
4 1,604
A quick check on Answers.com reveals that, not only is globular cluster M62 hospitable to life, it has some pretty...
Mar17-06 09:50 PM
DaveC426913
0 1,239
If you could be there to have a look, what would their color be? How transparent would they be? What would the waves...
Mar4-08 04:16 PM
cadnr
2 1,422
I'd like to let you know my conception on the universe. You will need just a minute to familiarize with it. Just jump...
Apr9-04 04:45 PM
wodnik
0 2,591
I have spent many hours today trying to determine at what distances certain substances will condense in protoplanetary...
Feb25-12 03:59 PM
PhoenixKnight
2 1,814
Voyager 1 launched in 1977 is ~10^10 miles out, near heliopause. Continuing at it's current velocity (3x 10^8 mph),...
Sep9-10 06:55 PM
qraal
1 1,397
I'm going out tonight to find a couple constellations at around 9pm corvus, libra, and hydra are my goals. Any...
Apr18-09 05:30 PM
orthovector
0 870
Might self-gravitating bodies, made primarily of liquid water, be characteristic of some extrasolar systems?
Jun25-09 11:17 PM
Loren Booda
0 810
So it's often said that the Andromeda galaxy is much wider than the moon, if you count all of its outer regions as...
Apr26-10 03:05 AM
russ_watters
2 2,758
When they say "branes" colliding to make a universe...do they mean universes crashing into each other to make a brand...
Feb3-05 11:36 AM
Garth
8 1,129
As above really
Aug26-11 10:01 PM
Drakkith
3 2,319
Hi everybody I just wanted to ask are all the galaxies in the universe visible by the light they send? In the other...
May6-11 05:24 PM
Nik_2213
17 3,307
Are any of you fans of the STS-107 crew even though they are deceased? Some people make MySpaces about them. :) But I...
Oct25-07 04:32 PM
ScienceGurl
0 938
there is so much in the literature about BHs, but AFAIK only observations of some gravitational disturbance has been...
May10-05 10:45 AM
Phobos
14 1,288
Are black holes black afterall? I remember reading in Hawking's book that black holes aren't black.
Apr4-05 10:51 AM
Billy T
22 2,165
A couple of quick questions after watching a video on the helectic model that the solar system follows on it's course...
Jun13-13 05:55 AM
Bandersnatch
7 1,953
Is the center of a black hole essentially a pole, or a "point at infinity"? I always thought about this in my complex...
Apr11-13 09:21 PM
Labguy
16 1,898

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