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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
282 104,516
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 80,550
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
499 146,999
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 88,918
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 38,581
In my other thread I learned that gravitation red-shift does exists. Now I'm thinking of an explaination of why most...
Jul7-04 07:07 PM
shrumeo
36 3,600
As I mentioned in another thread (relative to PG 1012+008), it is common for mainstream astronomers to treat...
Jul7-04 03:34 PM
turbo
0 1,216
produced by the earth affects or interference the communication system?
Jul7-04 09:42 AM
Nereid
3 1,371
hi... Juz curious... when does the gravitational pull of earth starts? eg: Let's say a comet/ a space rock...
Jul7-04 07:18 AM
Mike2
3 1,650
Was wondering how they steered cassini through saturns rings, on that note how do they know where these probes are at...
Jul7-04 12:08 AM
bozo the clown
3 1,130
Can some one explain to me how did the moon started rotating around the earth, especially, assuming that the moon's...
Jul6-04 11:07 PM
Chronos
11 1,347
Does anyone know anything about a tenth planet (a planet that orbits outside of pluto's and neptune's orbits) that was...
Jul6-04 01:16 PM
turin
6 1,198
From; http://saturn.jpl.nasa.gov/cgi-bin/gs2.cgi?path=../multimedia/images/titan/images/PIA06404.jpg&type=image A...
Jul6-04 12:22 PM
shrumeo
9 2,018
Mission to Saturn: International effort to explore Saturn, Titan NASA, the European Space Agancy and Italy's space...
Jul6-04 12:21 PM
Phobos
4 2,054
Why can't we see Venus at night but at dawn and dusk?
Jul6-04 12:01 PM
Phobos
1 1,809
What do you do when you lose a Lander? Simple, launch another TWO! Huh????????????? And why on Earth would anyone...
Jul6-04 08:15 AM
Dmcm01
2 1,470
Do polarization cross-sections from opposite microwave background n-poles disobey the Bell inequality?
Jul6-04 03:33 AM
Chronos
1 1,230
WMAP has conclusively proven an expanding universe. anyone care argue?
Jul5-04 08:20 PM
Nereid
7 1,743
As the universe expands and disperses, there is less of a gravitational well for photons to climb out of before they...
Jul5-04 09:07 AM
Dark Knight
9 2,238
Why must geostationary orbit at the equatorial plane?
Jul4-04 07:55 AM
LURCH
2 1,528
what do you people think? I dont think we ever did.
Jul2-04 07:18 PM
Greg Bernhardt
1 1,394
http://www.space.com/scienceastronomy/heavy_blazar_040628.html
Jun30-04 04:06 AM
Olias
10 1,332
Recently I read that Universe is 156 Billion Light Years in size. Even if every thing moves at speed of light, a 13...
Jun29-04 03:01 PM
shrumeo
28 2,495
Honeysuckle Creek 35th Apollo Anniversary Question: Who received the first images of Men walking on the Moon?...
Jun29-04 12:21 AM
Nommos Prime (Dogon)
0 1,387
Can anyone tell me how to locate HST images? There is a picture of NGC7603 on this web site. ...
Jun28-04 10:54 PM
Nommos Prime (Dogon)
5 1,574
http://www.space.com/scienceastronomy/mystery_monday_040524.html "All the pieces add up to 78 billion-light-years....
Jun28-04 06:56 PM
marcus
22 6,037
What is topological defects in cosmology? Is this a current field of research and what are their progresses?
Jun28-04 05:19 PM
meteor
1 1,388
Very interesting.
Jun27-04 05:44 AM
The Bob
21 4,233
Here is a current paper:http://uk.arxiv.org/abs/hep-th/0406230 the authors can only be described as the...
Jun26-04 05:35 PM
meteor
1 1,463
Are there any pictures of other sun's, like ours, in space?
Jun25-04 03:00 PM
Phobos
2 3,054
I'm sure this question is elementary for most of you, but I want to make sure I'm on the same page as everyone else. ...
Jun25-04 08:56 AM
Rybo
5 6,200
I was introduced to astrology just a while ago but i dont know too much about it. I just got a telescope and Im a...
Jun25-04 08:45 AM
Phobos
7 1,646
The debate about the origin of Saturn's moon Phoebe is over. While it may look like an asteroid, the tiny moon...
Jun25-04 02:23 AM
Orion1
0 2,067
"Astronomers have recaptured the sounds of the early Universe showing it was born not with a bang but a quiet whisper...
Jun23-04 02:23 PM
Math Is Hard
0 1,000
If the big bang theory were to be taken to court under the same umbrella as a capital murder trial do you think it...
Jun23-04 11:48 AM
Mike2
20 2,401
As we know for general relativity theory we live in a universe with (at least) 4 dimensions, 3 directions and time....
Jun23-04 05:44 AM
Garth
4 1,106
Hi have there been any recent publications that u guyz may have read that are against the idea of dark matter and have...
Jun22-04 07:55 PM
Nereid
3 2,692
I am in Atlanta Georgia. Does anyone know if I would be able to see the star Vega from here during the summer months?...
Jun22-04 07:02 PM
syano
10 1,858
The question of what the universe is expanding into seems to come up all the time and the answer is always the...
Jun22-04 06:04 PM
hellfire
16 2,161
the Rutan space(?) craft SpaceShipOne reached about 62 miles this morning and glided down for a safe landing ...
Jun22-04 03:51 PM
paul11273
6 1,082
A 43-year-old collegue of mine asked a childlike, yet intriguing question today. Perhaps someone could help answer...
Jun21-04 01:46 PM
TeV
8 1,545
What is the nearest supernova candidate (maybe Betelguese?) to the Earth?
Jun21-04 09:29 AM
RAD4921
4 1,548
Last night at around 11:00pm EST, I was outside doing some backyard astronomy. After looking at Jupiter for a little...
Jun20-04 09:37 PM
check
6 1,125
I'm trying to find some recent work describing the fate of a star in orbit around a BH. Thanks for any help.
Jun20-04 09:27 PM
Nereid
5 1,139
Th eother day while surfing I found a list of the 120 detected extra-solar planets. (Minus the 2 super giants) Just...
Jun19-04 10:16 PM
Janus
6 6,964

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