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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
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
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
499 147,127
Hi everyone Use this topic for posts about ongoing/upcoming stargazing events (e.g., comets, eclipses,...
Apr14-14 07:08 AM
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
139 88,992
Is the observable universe an exploded singularity or maybe even an exploded black hole?
Sep22-04 03:41 PM
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
3 2,496
Interesting experiment
May2-05 04:09 PM
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
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
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
10 1,583
Apr21-05 09:36 AM
5 1,210 June 1, 2003 This Week's...
Nov21-03 06:54 AM
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
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
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
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
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
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
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
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
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
7 4,228
Is there anyway we can determine if Betelgeuse has gone supernova earlier this month? (theoretically speaking)
Feb3-10 03:03 PM
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
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
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
1 6,064
Are there any planets visible this time of day, today?
Jul3-07 11:21 AM
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
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
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
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
1 1,177
These places seem great. Do places like these actually appear this way with the naked eye?
Jul6-11 05:49 AM
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
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
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
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
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
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
4 1,434
Do polarization cross-sections from opposite microwave background n-poles disobey the Bell inequality?
Jul6-04 03:33 AM
1 1,230
Bekenstein just posted a new paper on his relativistic MOND which obviates dark matter ...
Jan18-05 07:51 PM
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
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
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
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
6 1,028

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