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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
282 104,533
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
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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...
Dec12-13 08:47 PM
499 147,012
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 38,584
We often have questions about what telescope an aspiring amateur astronomer should buy. The "correct" answer can be...
Apr9-14 07:52 AM
234 80,567
Would you please tell me how long a starlight can reach my eyes ? I have heard that a star might have already gone...
May15-04 05:28 PM
1 1,268
I have a silly question: what do people understand by "the atmosphere of a gas giant" ? Isn't most of the planet...
Aug10-09 06:26 PM
2 1,628
Jan18-06 04:20 AM
16 1,662
two exiled stars are leaving our galaxy forever They are surely travelling fast!
Jan31-06 01:25 AM
3 1,056
man, after a long time i've got a question! Einstein proved that the universe is expanding but the the galaxies...
Feb11-06 11:30 AM
1 1,298
Hi i want know what sort of things can i include for a basic level astronomy. Despite doing physics I need some tips...
Feb4-09 05:46 AM
1 1,979
How do scientists counteract the radiation pressure of sunlight falling on artifical satellites for e.g. on solar...
Oct29-05 05:35 PM
7 2,087
Galaxies are all relatively the same size, ranging from a few thousand light years in diameter, to a hundred thousand...
May30-04 12:41 AM
3 1,687 Could we belong to a non-aggressive advanced civilization, which protects...
Sep30-04 09:31 AM
21 2,611
Iím in the process of reading a book by Paul Davies called The Origin of Life, and in it, it seems apparent that life...
Nov23-04 12:46 PM
62 8,304
Some physicists have suggested that the big bang might have been a black hole. Lee Smolin for instance has speculated...
Jun21-05 05:08 PM
5 2,199
Lets use Jupiter which has a diameter of 142,984 km at a distance from Earth of 5 AU or 747,989,353 km. The answer...
Oct1-05 02:46 PM
7 6,926 A $1 billion dollar cost growth on the mission is a lot,...
Nov23-05 09:08 PM
6 2,379 Anyone with some inside information?
Feb21-06 01:25 PM
7 2,530
Because if would seem to me, that planets suffer relativly little disturbance from these collisions, that is, they're...
Dec7-06 12:49 AM
7 2,111
In a question is says that Brightness = Luminosity/4πr₂ (for a star). Procyon = 7L☉ and 11.41 light years as...
Aug22-09 09:52 PM
5 7,334
What are the similarities and differences between a black hole and a black body?
Jul31-03 08:07 PM
2 3,999
Hi, I'm doing some astronomy work and one problem involves using Rydberg's constant. However, it is inverse meters...
Sep29-07 10:00 PM
3 7,469
I come from an experimental backround with no astronomy so im hoping this question makes sense! If the theory of...
Jan6-11 06:45 AM
26 3,798
Help me please! do'nt know if i'm right here, but any hint leading to a simple answer of the following question would...
Jan22-04 01:02 PM
7 3,732
In world war two the British used a Poisson distribution to analyse where V-rockets were landing in London and showed...
Feb26-07 04:27 PM
MadScientist 1000
7 2,906
Are the other planets in the solar system getting hotter like the Earth and if they are would this mean that the...
Feb25-07 05:43 PM
MadScientist 1000
13 7,275
If something hit the Earth billions of years ago and caused a molten blob to be released from it,and this blob settled...
Feb27-07 10:46 AM
7 3,617
Why are there no big rocky planets - all the big planets are gaseous. Did big rocky planets get smashed up and end up...
Feb27-07 10:06 AM
Newbie says Hi
6 2,142
According to Wikipedia,99% of the mass of the Kuiper Belt is missing. Models show that the observed mass of objects...
Feb26-07 05:25 PM
0 980
When an electron and anti-electron come together a gamma ray is produced. So are gamma ray bursts just the product...
Mar1-07 07:18 PM
2 1,524
Doe sanyone have any information of the binary star "Wormwood" can they offer any insight as to how it coinsides...
Sep14-07 11:40 PM
Ivan Seeking
1 2,026
Our perception of what a galaxy looks like is inherently skewed given that the immense size of the galaxy itself...
Sep28-07 11:26 AM
Mike S.
8 1,999
Hey everyone, I'm doing an exam review that's telling me to know what "Quake Confinement" means... and other than it...
May1-09 12:08 AM
2 934
In South Pole, In which direction will the sun rise?
Feb22-12 06:06 PM
3 1,571
How do we calculate the magnitude of a system composed by some binary systems of stars?
Feb23-12 12:05 AM
2 1,650
Hello I am a student in high school and my physics teacher is a complete idiot. He just gave us a project to draw the...
May29-07 01:23 AM
2 2,369
In pictures that we find of galaxies and nebulas there are usually very bright colors in them. For example, if you...
Dec10-11 11:51 PM
11 4,708
I am interested in, and would apreciate very much, if someone could further me updated information or any information...
May12-03 12:59 PM
8 1,359
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 4,538
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
0 965
SpaceTiger's Note: Taken from Please shoot this, somebody (Laura Mersini-Houghton paper) Sorry, this question is...
Sep7-06 03:43 AM
12 2,577
ok il say this now im curious what would happen if you were able to bend the accretion disk and the ergosphere so that...
Nov13-10 08:25 AM
1 1,332
The temperature of the sun is so high that the matter exists in plasma state.At such high temperatures electrons are...
Jul30-12 03:20 AM
24 4,047
Hi everyone, I have seen this reference and I have...
Jan22-12 08:53 PM
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