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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
282 104,722
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 89,113
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
499 147,271
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 38,650
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 80,830
I finally broke down and looked at the the thread "Proof of the cause of Gravity" and thought that I might present a...
Nov28-03 03:24 PM
Sniper__1
24 22,536
http://www.newscientist.com/news/news.jsp?id=ns99994136
Dec11-03 03:11 PM
Andre
12 2,863
http://www.cnn.com/2003/TECH/space/10/13/offbeat.moon.ap/index.html I got a bad feeling about this.
Dec15-03 11:01 AM
Rader
17 1,947
if there were aliens what makes you think that if were scared of them, they wont be scared of us...they might be as...
Dec5-03 08:51 PM
Nereid
26 3,245
http://arxiv.org/abs/astro-ph/0203466 We present new spectroscopic observations of an old case of anomalous...
Nov28-03 03:58 AM
wolram
18 4,463
I have some trouble seeing these two things. Lets say the big bang did happen, and the universe is expanding... ie all...
Nov27-03 01:51 PM
meteor
4 2,110
Recently read in an article that the fuel of the future was antimatter... My question is how would they contain...
Dec9-03 05:55 AM
Sariaht
16 2,616
What shape is the universe presently believed to be? and Is it possible to visualise the shape? Any thoughts...
Dec1-03 11:08 AM
sivanesan
19 2,307
As far as I know (and I may be horribly wrong), aside from the maneuvering that occurs during takeoff and landing,...
Nov28-03 06:02 PM
jimmy p
13 3,560
Something I've thought about before but never asked anybody...The existence of short-period comets is a problem if one...
Nov27-03 02:04 PM
Nereid
3 2,847
I want to pursue for a Ph.D in these area.
Nov27-03 09:54 PM
Ambitwistor
3 1,352
Hi, What is the orientation of the ecliptic plane of our solar system in relation to the plane of the galaxy? ...
Nov28-03 01:24 PM
Labguy
6 12,677
if a massive body fails to become a star could it still suport planetary system?
Nov30-03 12:04 PM
Labguy
1 1,239
Hi all, I'm a musician from Ireland, I write electronic music. I browse these forums sometimes as I have a passing...
Dec1-03 05:56 AM
elektrovert
2 1,718
I've been reading some books on Galactic Structures and Galactic Evolutions, evidence from rotation curves of stars...
Dec1-03 07:50 AM
Nereid
5 9,178
Not the PF Mentor! Very cool pic, from the Viking 2 spacecraft, of the Martian moon Phobos over the volcano,...
Nov29-03 08:37 PM
Phobos
3 2,456
which one is easier and applicable. I think back to the past will be certainly very expensive. because after going...
Nov28-03 05:18 PM
Erdem
0 1,393
I have a question. I'm not even sure that it makes sense or is a worthy question, so please bear with me. Is there...
Nov28-03 09:34 PM
Ambitwistor
2 1,070
I have heared people say that the universe has no size or shape. My problem with this is how can the universe be...
Nov30-03 01:40 PM
Nereid
4 3,588
It's called Orbiter, and you can get a free copy here: http://www.medphys.ucl.ac.uk/~martins/orbit/orbit.html ...
Nov30-03 06:28 PM
Janus
3 4,248
I'm trying to model the possble average world temperature for any given day of the year, for planets at varying...
Dec8-03 02:02 PM
Blissfulpain
7 1,369
Hi, I am an undergrauate in physics right now, and I am trying to figure out where I want to focus my attention...
Dec2-03 03:00 PM
JasonZ
2 1,514
In recent analysis of the microwave background (e.g. that one which lead to the dodecahedral model) it is argued that,...
Dec2-03 05:00 PM
hellfire
0 1,273
I've mentioned this before, the problems that might arise if the moon were to leave our orbit. However, I never really...
Dec13-03 05:14 PM
Rader
15 5,320
i remember a referance to, binary pairs in the kuiper belt, i can not remember if a mass for the objects was given...
Dec4-03 05:15 PM
Nereid
9 1,673
are there any black holes found that have no companion stars or anything with them, are there any found? if so...
Dec17-03 06:50 AM
Labguy
7 1,462
How do solar wind particles get trapped in a planet's magnetosphere? The particles travel along the Sun's magnetic...
Dec5-03 10:43 PM
Nereid
4 3,059
Way cool. http://www.astro.princeton.edu/~mjuric/universe/ - Warren
Dec6-03 12:47 PM
jcsd
3 2,864
I wonder, Why is it so easy to imagine simple ETs, but so difficult to accept God(s) or God ETs as having been here...
Dec7-03 10:44 PM
Phobos
3 1,024
Can anyone provide a link or document that compares the properties of the planets? I'm interested in all of the...
Dec9-03 07:09 PM
StephenPrivitera
8 2,798
ive just read about it in the astronomy magazine but does anyone know more in depth about it?
Dec8-03 02:47 AM
meteor
2 2,425
How do I calculate galactic mass as a function of r? I know it is supposed to be proportional to r. I've seen,...
Dec8-03 09:53 PM
StephenPrivitera
1 1,856
I know that looking back in space is looking back in time. I also know that seeing the Big Bang should be beyond us in...
Dec8-03 10:03 AM
Nereid
24 2,438
If a telescope is 2 time bigger in diameter then you can see object 4 times fainter, but does that mean that object...
Dec10-03 05:12 PM
chroot
6 1,472
What I've heard is that galaxies are spinning weirdly. They are spinning on the outer regions too fast. Also that the...
Dec15-03 05:10 PM
TheDonk
12 1,198
From: http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=34339 "The Moon is currently the focus of an...
Dec8-03 06:43 PM
Nereid
0 1,137
Anyone know just who (and when?) came up with the term 'multiverse' to describe the parallel or multiple universe...
Dec10-03 12:48 PM
selfAdjoint
3 997
This may be a simple question but I didnít found anything in my references: the vacuum energy density is a constant...
Dec16-03 04:59 AM
ranyart
7 2,532
This Paper may be large, but it is a must for some pretty far reaching consequences for Cosmology. ...
Dec16-03 11:15 AM
Labguy
2 1,771
I have a serious question which has been on my mind for awhile. I was thinking about the problem three months ago,...
Dec19-03 01:31 PM
chroot
14 2,514

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