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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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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 80,680
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 38,605
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
499 147,127
Hi everyone Use this topic for posts about ongoing/upcoming stargazing events (e.g., comets, eclipses,...
Apr14-14 07:08 AM
Borg
282 104,608
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 88,992
Is the observable universe an exploded singularity or maybe even an exploded black hole?
Sep22-04 03:41 PM
marcus
4 1,968
How does a Big Bang occur at every point in space. It is easy to comprehend something exploding at a point and sending...
Nov20-03 03:49 PM
Nibles
3 2,496
Interesting experiment http://www.usatoday.com/tech/science/discoveries/2005-04-19-big-bang-mystery_x.htm
May2-05 04:09 PM
Phobos
1 1,199
So my first question is, how do we know how many stars are in our galaxy? And the second is, how do we know the big...
Jul3-09 08:45 AM
DaveC426913
7 1,081
Hi, I'm a high school student and a new member, and upon reading I found something that's quite disturbing for me. It...
Dec16-05 09:49 AM
M Telepathic
3 4,750
The Big Bang was basically caused by an extreme heating up of energy, right? Well, how did that energy get there if it...
Jan8-05 02:47 AM
Chrono
9 1,557
I had a thought while I was driving to work this morning. If the Big Bang bundled up the universe into a massive...
Aug3-05 09:43 PM
Yaaks
10 1,583
http://www.cnn.com/2005/TECH/space/04/18/liquid.surprise.ap/index.html
Apr21-05 09:36 AM
selfAdjoint
5 1,210
http://www.google.com/search?q=baez+redshift&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=40&sa=N June 1, 2003 This Week's...
Nov21-03 06:54 AM
wolram
0 1,060
The big bang occured after a singularity evaporated, correct? All that there was in the universe was "in" the...
Apr22-04 03:17 AM
Nereid
1 974
I was reading some stuff about the big bang and about the singularity. When the big bang happens, is a whole lot of...
Jul6-05 09:52 PM
mathman
5 922
How in the heck do physicists know that spacetime was created at the big bang just by observing galaxies moving away...
May21-10 02:44 AM
xxChrisxx
1 1,145
Hi, The theory about big ban says that there were high temp. and high pressure. But pressure=force/surface I want...
Dec2-12 05:23 PM
Drakkith
1 1,317
White holes are supposed to be the opposite of Black holes, but white holes have not been observed AFAIK, so if...
May22-05 06:00 PM
wolram
0 1,013
If there is a black hole at the center of our galaxy, why does the center of our galaxy looks so bright?
Apr5-09 11:35 PM
Nabeshin
2 905
1) I read about BIG BANG THEORY .. I was wondering if their was a lump of matter that blasted and as a result the...
May23-05 06:10 PM
Phobos
5 1,105
Did a brown dwarf ever experience fusion? What is the smallest size star, ie., sustained fusion model? ... how...
Sep1-10 02:31 PM
qraal
7 2,573
Hey all, I'm starting to design my first home built telescope. I already own a 10" dob which works great but I've...
Aug25-10 08:57 PM
chemisttree
7 4,228
Is there anyway we can determine if Betelgeuse has gone supernova earlier this month? (theoretically speaking)
Feb3-10 03:03 PM
scupydog
2 2,700
Hello all i'm here in the uk just lookin at Betelgeuse and for some reason it looks redder tonight has anyone any idea...
Mar8-09 04:16 PM
scupydog
11 2,498
My favorite star (I my Phd on making pictures of it) is shrinking and may be about to go SN, or since it is 400 odd ly...
Jun11-09 01:17 PM
Sidnv
3 2,991
How would I got about learning the mathmatics side of Astrophysics. What would someone have to know? And are there...
Nov23-04 11:14 AM
Phobos
1 6,064
Are there any planets visible this time of day, today?
Jul3-07 11:21 AM
russ_watters
4 1,318
Due to my interest in astrophysics, I have decided to consider purchasing a telescope. I am looking for something...
Feb13-14 11:28 PM
Chronos
35 2,142
I'm writing a program that models objects in our solar system in 3D with lots of functionality. (Senor Project in...
Mar22-13 07:44 AM
phyzguy
3 1,504
What do you think is the best type to find planets in the habitabel zone? What do you think of the suggetsion of white...
Feb25-13 02:54 PM
snorkack
16 5,180
Another cloudy night... sigh. Statistically there should be one month which has the greatest number hours under...
Jul24-10 12:02 AM
russ_watters
1 1,177
These places seem great. Do places like these actually appear this way with the naked eye?
Jul6-11 05:49 AM
russ_watters
4 2,787
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
tiny-tim
1 1,597
so, for best resolving power, the objective lens of a telescope needs to be as large as possible, and have the fewest...
Dec16-10 02:52 PM
mheslep
12 5,113
I would be thankful to you, if you tell me which book do you consider to be best, on the subject of cosmology, for: ...
Nov5-11 09:12 PM
mjacobsca
4 11,790
Hey guys I am pretty new to astronomy. I am getting a budget laser pointer for astronomy however I don't know what...
Oct28-12 11:09 AM
blackmagicdud
0 158
I am curious to know what would be the benefits of a Lunar Base? I know that some benefits include the harvesting...
Nov1-11 04:32 PM
berkeman
44 5,775
Can anyone find us an online photo of a galaxy that is z = 1.4? I'd like to be able to point in the direction and...
Sep24-08 03:15 PM
chemisttree
4 1,434
Do polarization cross-sections from opposite microwave background n-poles disobey the Bell inequality?
Jul6-04 03:33 AM
Chronos
1 1,230
Bekenstein just posted a new paper on his relativistic MOND which obviates dark matter ...
Jan18-05 07:51 PM
marcus
9 1,896
It just got me thinking, if I were to be in outer space, and assuming there's no gravitational pull from some other...
Apr6-13 06:38 AM
phinds
2 1,001
Hello everyone. I am an undergraduate at Ball State University, pursuing a Physics major, with an Astronomy minor. I...
Feb17-04 11:51 AM
NanoTech
0 6,827
In a few days (pay day) im hoping to buy a telescope as ive always been interested in the stars but i really am...
Oct27-05 09:44 PM
turbo
11 1,067
Hey everyone, I was hoping if any experienced astronomers could help me out here. I'm looking to buy my first...
Mar3-09 10:12 PM
Saturni
6 1,028

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