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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
282 104,713
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 89,101
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
499 147,266
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 38,646
We often have questions about what telescope an aspiring amateur astronomer should buy. The "correct" answer can be...
Apr9-14 07:52 AM
234 80,819
How do you determine angular size from an object such as an asteroid? I tried searching the web but there were no real...
Sep24-04 04:38 PM
2 3,022
hi folks, maybe somebody can help me with this: According to the standard theories of cosmology, the universe...
Dec14-10 12:15 PM
4 5,794
Light just now reaching us from Andromeda Galaxy was created literally millions of years ago, around 2.5 to be in the...
Sep12-13 02:51 AM
5 1,426
Tonight was an amazing night for stargazing so I drove about 10 minutes to a nice countryside road with barely any...
Aug28-13 11:57 AM
3 1,584
I've often heard there's no solid ground in the gas giants, but do we know this for a fact or are we just guessing...
Sep2-13 03:14 PM
5 1,437
Well, this is awkward. I seem to have forgotten what star has a 0.0 value in the V-I color index. I almost want to...
Nov26-07 10:14 PM
2 3,234
I have read two contraditory explanations of why the 2nd Law of Thermodynamics would prohibit an oscillating universe...
Nov25-03 03:42 PM
20 3,221
Does anyone know if VSL theories are being seriously researched, studied, and pursued? -Glenn
Nov10-03 03:39 PM
4 2,893
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
6 12,675 Quote from article... "Cosmic rays are not actually...
Jan20-05 06:44 PM
12 1,203
Has there ever been a hypothesis or theory propsed (current or obsolete) proposing that the rocky planets formed from...
Dec22-04 02:58 PM
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Is it theory or fact that the universe is 4% baryonic, 23% Dark matter, 73% Dark energy. Theory right? -Glenn
Jan7-05 05:30 PM
3 1,459
What are the smallest masses that could theoretically be put in space and set up in an orbital configuration. example...
Jan31-05 07:49 PM
16 2,032
As the title says, just seen this Video...
Feb3-10 12:08 AM
Ivan Seeking
10 3,975 What do you guys think of this? I'm just a...
Sep24-09 01:55 AM
0 1,801
In terms of damage (if any) - What can a Hyder Flare cause?
May24-10 02:55 AM
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I saw this on another site. The star Betelgeuse going supernova soon? I was talking to my son last week (he...
Jul10-11 04:20 PM
35 24,983
Our carpool conversation this time of year usually involves the shortening daylight hours, which are quite noticeable...
Nov15-13 03:01 PM
8 1,271
The Andromeda galaxy is hurtling towards us at 250,000 mph, in relation to what? Speed here on earth is generally...
Apr10-14 11:54 PM
8 594
We have a good handle on what other galaxies look like, given that we're looking at them from a distance. But when I...
Apr16-14 11:44 PM
5 576
I've been reading about terraforming and really stuck with it. Which planet /moon has the most convenient conditions,...
Aug24-12 09:02 AM
62 12,062
As the topic says: What's your speculations about Theia? Was it really the reason that the Moon appeared and what...
Aug6-11 08:33 PM
2 2,526
Hi all! I didn't know where to put this topic but since I thought it's general for all planets and gravitational...
Feb2-13 01:20 PM
20 11,579
I find this (quite new web page I think) very interesting: ...
Dec10-11 05:09 AM
0 1,771
Hi there! Well, it's not just a photo taken by a cellphone but a cellphone plus a very good binocular. And as...
Mar17-13 06:33 AM
39 9,684
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
0 1,774
Where can I get some data for Binary Star system? Thanks in Advance
Jul15-08 02:06 PM
2 1,491
Hello, Could you please tell me roughly, how many galaxies have been observed? Thank you, Glynis
Apr24-07 10:54 AM
10 3,102
If I went up in an air baloon and came back down about 12 hours later (assuming there was no wind), would I be half...
Jan21-06 12:48 PM
6 1,004
In the Letters section of the August issue of Physics Today, a reader claims that when he asks 'newly minted physics...
Oct13-12 06:51 PM
13 2,701
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
4 4,258
Hello Everyone, I am currently designing project where part of it will involve a website and amoungst things, on the...
Aug21-04 05:07 PM
Goats Dont Shave
2 10,099
How is it possible for one planet to rotate opposite the others and one to rotate 90 degrees axially from the others,...
Apr22-10 09:11 AM
4 2,425
Is it possible that the chicxulub impact is responsible for the earths magnetic pole being tilted 15 degrees off the...
Feb16-11 10:35 AM
26 4,690
As a fun teaching tool for several areas of math and science, imagine that happening. The planet floats in water. What...
Nov26-06 10:53 AM
MadScientist 1000
2 2,914
:confused: I Read an article about the IMAP data being flawed because of polorizations in our solar system, if this is...
Dec28-04 04:00 AM
2 1,445
I've seen this mentioned on another post but some questions remain, the earth rotates about it's axis as I understand...
May3-05 12:42 PM
10 1,643
I havn't seen this posted here, but its a nice picture of ice on mars. ...
Aug15-05 03:50 PM
1 1,438
poll A Poll ( 1 2)
Here is a many alien civilizations do you think are existing in the Milky Way at this moment. - 1 - 10...
Jun16-05 12:20 AM
22 2,068
This topic brings up the Fermi Paradox, once again. I just want to hear the boards opinion on this...should the galaxy...
Nov12-05 11:00 PM
65 5,124

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