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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
282 104,713
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 80,819
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
499 147,266
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 89,101
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 38,646
So is there? :) ... Is there anything (radiation waves, particles, what not...) That Sun absorbs more than it emits? I...
Oct3-09 02:59 PM
looka
16 3,182
When people say the universe is expanding, do they mean that the galaxies etc are moving farther apart from each other...
Oct3-09 12:51 PM
dextor
5 1,209
Imagine a lets say sphere the size of an atom or so, somewhere in deep space, without any matter in it, just a...
Oct3-09 03:27 AM
looka
10 1,461
To fully understand the principles by which light operates we have to know that if you look far enough away you can...
Oct1-09 01:46 PM
Chewy0087
11 2,162
How have we taken the picture of our own galaxy? All the milkyway pictures look like taken from outside the galaxy.
Oct1-09 01:45 PM
fawk3s
35 10,948
Hi all, Our sun is approximately a spherical body and accordingly it has a spherical potential. I have just learned...
Sep30-09 07:23 PM
D H
2 1,831
Hi all, This question may seem innocent, but I can't see a clear boundary between the two. Who could explain it...
Sep30-09 09:14 AM
Wallace
4 13,980
What do we know about the atom? All we know is that it has mass and that mass is energy. We know that when you smash...
Sep29-09 08:29 PM
russ_watters
10 6,608
Hi all, just looking on google mars and have found an unusual crater, it seems to me that a meteorite has landed in...
Sep29-09 12:27 PM
DaveC426913
1 1,129
Hello folks... I am writing an article where I discuss discoveries in astronomy that were intially disregarded in...
Sep28-09 07:17 PM
Petronut
15 2,461
Hi, I am working with a fish eye camera, i am trying to figure out how can i map an unknown point in the image to...
Sep28-09 05:29 PM
glory1985
0 1,774
I was wondering what is at the center of our galaxy? could it possibly be large amounts of nebula's in which we are...
Sep27-09 10:33 AM
Fredrik
25 3,059
http://scienceblogs.com/catdynamics/2009/09/water_water_everywhere.php Nasa press release from 24 September....
Sep26-09 07:52 AM
Sorry!
2 1,324
I saw Jupiter (and four of its moons), Neptune, Mars and Venus but they were all really tiny so I was wondering if the...
Sep25-09 05:49 PM
turbo
12 1,909
How is time travel possible? i understand that we can warp and modify time but i dont understand the concept... ...
Sep25-09 03:26 PM
qraal
1 1,502
Forget that tired old image of the moon as a entirely dry locale, devoid of any moisture. A recent set of discoveries...
Sep25-09 11:05 AM
Cryptonic
6 1,723
http://www.timesonline.co.uk/tol/news/science/space/article6846639.ece What do you guys think of this? I'm just a...
Sep24-09 01:55 AM
Glennage
0 1,801
I am looking for star catalogs of stars within 200 lys of Earth for a project I am working on. I would like to have...
Sep23-09 11:38 AM
Insanity
6 1,447
Why does Saturn's dust form a flat ring and not a sphere around it?
Sep23-09 06:07 AM
qraal
2 4,453
Which statement is true? A The apparent speed of recession of a galaxy is given by the product of the Hubble...
Sep22-09 11:03 PM
Berry Ives
7 1,976
Alright, so basically, I'm freaking over this. Not littiorally, because the assignment isn't worth THAT much. But I've...
Sep22-09 09:55 PM
lightsilver
0 1,868
What is new with SETI? What is new with SETI? The last I heard was that the SETI@Home project is now bundled with...
Sep22-09 08:03 PM
Monocerotis
9 1,828
You can get a calculator and start counting the errors and false assumptions contained below if you want.. but I gotta...
Sep22-09 03:00 PM
chroot
1 1,063
when you log in to google earth it seems to go generally above where i am. when i press the sky button on it does it...
Sep21-09 10:06 PM
mgb_phys
2 992
Might there somewhere in the galaxy by a star with a giant set of rings, just like those of our own saturn, only much...
Sep20-09 05:43 PM
Cryptonic
6 1,488
Well I've decided to buy my first telescope and I've been searching craigslist for 'em. My price range is ~$200 and...
Sep18-09 03:11 AM
Chronos
10 1,332
http://www.eso.org/public/outreach/press-rel/pr-2009/pr-32-09.html Ever wonder where the Eagle Nebula is in our...
Sep17-09 10:03 AM
Arch2008
0 970
I discovered an eclipse cycle. It will be called the Wells cycle ( Garrick Wells ). It is simply a cycle of 51649...
Sep16-09 01:50 PM
negitron
3 1,705
how is it known that iron is formed in stars and not anything heavier? And how is it known that elements like uranium...
Sep14-09 09:11 PM
sathearn
37 3,591
Somebody once told me that when you look into the night sky to view stars, you are actually looking at something that...
Sep14-09 02:05 AM
t_n_p
7 1,297
New Images just released from Nasa- So happy we still have Hubble! They're everywhere on online, though You can...
Sep14-09 01:27 AM
matt.o
9 1,917
Hi, I saw the occultation of the star Regulus by the Moon 2 years ago (June 2007). I wonder how often this event...
Sep13-09 05:25 PM
Nan
8 1,755
Publicity often says that a new telescope can detect a candle across the Atlantic, etc. Well, a candlepower is...
Sep13-09 04:50 PM
map19
4 574
You might have heard about this story, it was on slashdot.org last week. On July 6th 2009 at 1:04 AM a fireball...
Sep10-09 03:27 PM
solarblast
1 2,393
Andromeda M33 M81
Sep5-09 10:44 AM
Count Iblis
16 3,553
are there more advanced forums than this for astronomy/cosmology? I asked a few questions without reply on here so...
Sep5-09 02:20 AM
smallphi
3 1,769
Several space probes was by gravity assist manoeuvre gaining between 4 and 13 mm velocity per second. Are this values...
Sep4-09 08:20 PM
Widdekind
9 2,322
Does anyone have an intuitive explanation why the gravitational force of a uniform sphere on a distant point is the...
Sep4-09 03:01 PM
AxelBoldt
8 7,394
I'm trying to show that for certain combinations of altitude and inclination there will be periods of the year where a...
Sep4-09 11:26 AM
D H
4 4,258
At scales of galaxies there is obvious rotational motion but I am wondering if there is an example of a rotating...
Sep3-09 06:52 PM
matt.o
3 1,597

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