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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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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...
Apr22-14 01:42 PM
502 147,663
Hi everyone Use this topic for posts about ongoing/upcoming stargazing events (e.g., comets, eclipses,...
Apr14-14 07:08 AM
282 105,004
We often have questions about what telescope an aspiring amateur astronomer should buy. The "correct" answer can be...
Apr9-14 07:52 AM
234 81,254
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 89,374
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 38,750
I wonder if some old stars will become invisible to our eyes after a while because of the redshift? Since they get...
Mar11-13 04:04 PM
3 1,264
When the Universe was 379,000 years old, the radiation could travel into space. From that point in time the CMB...
Mar11-13 03:33 PM
1 1,288
I have been trying to figure out why I can see Mars, by eye, even when it is very close to a bright, almost full Moon....
Mar9-13 03:49 PM
8 2,053
When a star comes to the end of one phase in its life (eg red giant -> white dwarf), or simply 'explodes', it results...
Mar9-13 02:13 AM
11 1,981
Hi, I was asking myself if there is, or might be a way to see far away objects in space in real time? What I mean...
Mar8-13 11:46 AM
4 1,453
I understand that the moon doesn't fall down because it is in an orbit around the Earth. Is this orbit created by...
Mar7-13 05:09 AM
16 5,716
So I heard a strong solar flare can emit so much radiation that outside the magnetic field of the earth one would die...
Mar7-13 05:01 AM
0 970
Anyone interested in going over some crude experiments and having a look to see if anything stands out as incorrect or...
Mar7-13 03:12 AM
14 2,148
Hi I am trying to figure out if there is call for a small, commercial, educational radio telescope to measure the...
Mar6-13 02:57 PM
0 1,167
As I understand it, the rate at which the universe is expanding is increasing. Can the rate of expansion ever exceed...
Mar6-13 02:49 PM
2 1,270
Hi, I was wondering if a planet moves up and down as they orbit the Sun due to the differing inclinations of the...
Mar6-13 09:00 AM
2 1,217
Hiya, First off, I'm not sure where to post this topic. I was thinking either the homework section, or General...
Mar4-13 10:02 PM
15 2,132
Voyager spacecraft finds solar system is bigger than thought: ...
Mar4-13 11:29 AM
1 1,843
After waiting about 10 days for clear weather last night and this morning I spent several hours testing a new...
Mar4-13 09:53 AM
5 2,148
Hey! I'm doing Science Olympiads and my category is Astronomy. We're allowed to bring in a laptop with whatever we...
Mar4-13 06:30 AM
4 1,578
I'm looking for a more or less definitive answer for the earliest time when rocky planets could form. I saw one...
Mar3-13 05:33 PM
10 1,402
Can we see if a planet is inhabited 1 million lightyears away (presently)? No, correct? We we actually be seeing...
Mar2-13 01:25 PM
12 2,039
Check out the University of Arizona's Huygen's Titan Descent Movie Garth
Mar2-13 10:05 AM
7 1,852
This video] explains the mechanism behind aurorae, but i need some...
Mar1-13 06:24 PM
2 1,403
I have heard people say there is no center to the expansion of the universe. I have also heard the expansion...
Mar1-13 04:01 PM
3 1,313
Mar1-13 01:10 PM
Greg Bernhardt
3 985
First post...Hi everyone. Now that the Chelyabinsk meteor has been determined to be 700,000 tons and 56 feet in...
Feb28-13 06:41 PM
2 1,310
It is thought that the universe is roughly 14 billion years old (soon) and that all matter came from a singularity...
Feb28-13 06:24 PM
26 4,576
Hey all, I haven't been alive for that long, so I guess my data probably isn't as good as it should be, but in my...
Feb28-13 12:23 AM
1 833
In my astronomy lab we (part A) calculated how many arc seconds a super nova remnant had expanded from 1942 to 1976,...
Feb27-13 08:12 PM
0 488
Hi, I was just wondering, why are we only looking for massive compact HALO objects? Can there not be such objects...
Feb26-13 10:29 PM
8 987
Hello. In my book with examples of astronomy, I found this: Calculate, around which the known celestial bodies in...
Feb26-13 06:50 AM
2 813
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 5,204
How high is usually the probe above the surface of the cosmic body? It would be best if it was specifically the...
Feb25-13 07:40 AM
Simon Bridge
1 700
I have this question posed in my astronomy class; where do sub-storms originate in the Earth's magnetosphere? My...
Feb24-13 03:54 PM
0 680
Hi I read up on astronomy for fun and I find the cosmos very fascinating my question is what determines the...
Feb21-13 05:37 PM
6 974
This not only goes for water, but any hot, melted substance suddenly exposed to the near vacuum of space. For...
Feb21-13 05:19 PM
4 1,553
Lets say Earth as a moon of a gas giant. Lets say it orbited the gas giant the size of Saturn every 24 hours. I...
Feb20-13 01:01 AM
7 1,382
Hey, I'm trying to start learning about astronomy with my brother's old telescope and I need a little help in getting...
Feb18-13 12:28 PM
5 1,303
My wife, myself and another viewer were watching the Geminid meteor shower at about 2:00 AM on 23 December, 2012. Most...
Feb17-13 10:06 PM
Traz 0
12 2,783
Hi!! I am not much of astrophysicist or something but read something about Black hole information paradox in a...
Feb17-13 08:22 AM
8 1,284
From what i understand Io is extreamly active on geologically. So does it also produce plate tectonics?
Feb16-13 11:38 AM
1 1,140
Hi. I have been researching the Earth-Sun analemma and I found this document about deriving the Earth-Sun analemma...
Feb16-13 09:20 AM
0 715
Good Day Everyone, I am trying to find out the rates at which the inclinations of the Solar System's planets...
Feb15-13 05:38 PM
1 859
Hi, Iam thinking of making my own telescope and I have a magnifying glass lens, biconvex, about 10 cm in diameter and...
Feb14-13 09:32 AM
5 585

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