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- Celestial objects, space, and the physical universe as a whole.
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Jan16-12 Greg Bernhardt
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.
Jul3-14 06:29 PM
140 114,320
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 45,318
Maybe not the correct sub-forum for the question, but is the total amount of water on the planet constant ? I know...
Feb11-14 04:45 PM
15 2,184
Does anyone know the equation used to find the speed of a distant star?
Mar8-09 07:38 PM
Ultrastar 1
11 5,270
Hi, how can I measure? I have'nt got any advanced tools (I have got a telescope only)! I think it is possible,...
May24-04 09:43 AM
11 8,754
Hi friends, I'm a user of Meade's 12" LX200GPS and I was looking for the software to connect my telescope to my pc,...
May24-04 07:47 PM
3 3,984
Signs point to life on Mars, billions of years ago, even before Earth.. Is it possible that Asteroid impacts,...
Aug31-12 07:17 PM
25 2,859
How come in pictures taken from space, we cannot see stars or the sun? Is it the atmosphere that allows us to see...
Jul26-12 11:53 PM
13 1,997
I may not know everything about astronomy, but I thought I had a pretty good understanding of the moon. How come it...
Aug9-12 12:21 AM
7 1,368
If the Earth still rotated and stayed on its course around the sun, but the moon was orbiting in the opposite...
Oct14-12 12:49 PM
17 3,988
I was reading up on black holes when i thought of this. Black holes have been found to emit radio waves. I was...
May2-06 07:28 PM
2 4,214
Please suggests books which could thoroughly introduce me to the field of cosmology/astronomy (i hardly know the...
Jun27-05 04:30 PM
3 1,791
Well I'm surely interested in astrophotography. Or maybe not. I really don't know -- to be completely honest. I am...
Jul6-05 11:31 AM
7 1,391
Question: Imagine you go out tonight at 9:00pm and see a star rising on the horizon. If you go out tomorrow at the...
Oct8-05 11:15 AM
5 5,907
NOTE: I am only posting in this forum because nobody will answer my question in the Homework forum. Please do not move...
Oct31-05 11:01 AM
0 1,209
Is it possible for an object to deorbit something it's revolving around? Today my Cosmology teacher said that it was...
Sep24-03 11:15 PM
7 2,459
Could someone please explain Gravitational Radiation in Laymen terms, and how it causes a decrease in orbital speed...
Sep24-03 11:46 PM
Loren Booda
2 2,173
Gravity acceleration value depend on planet and stars mass. On the earth, the well known average value is 9.81 ms-2....
Nov2-09 03:21 AM
2 1,047
First off I couldn't decide whether to enter my question in the relativity section or this one, so if I'm in the wrong...
Mar23-14 01:05 PM
13 1,615
I was reading an interview with Carl Sagan, where he described how a wormhole would theoretically work if you travel...
Mar20-11 01:23 AM
10 3,475
What is the minimum distance between earth and mars in course of their rotation in orbits? I need the derivation and...
Aug15-12 07:20 AM
1 1,302
Does a black hole have a radius or is it zero? I dont mean the event horizon, but the matter that have been squized...
Jul19-07 11:11 AM
12 2,786
Hi all, Why is it that the planets in our solar system seem to orbit relatively in the same plane? ( or is it a...
Dec12-06 01:01 PM
9 1,576
This article on EarthSky mentions the possibility that a superstar, VFTS 682, might've been "ejected" from a nearby...
Jun17-11 09:49 PM
0 1,093
Hi, I'm an amateur cosmologist/physicist and I was hoping that someone more well-versed in these areas may be able to...
Apr25-03 10:45 AM
1 1,890
What do you think the Universe is? What is its purpose? What is life's role? More specific question: Does anyone buy...
May7-03 08:00 PM
3 990
How far from Rigel would we have to be to find a substellar temperature comparable to that of the Earth? I know...
Mar7-11 04:07 PM
1 1,053
Hi guys this is my first message Can we assume that every spiral galaxy has a massive black hole at the center? ...
Jun30-03 01:17 PM
9 2,273
I read that the radius of the universe is around 1.3x10^26 meters but I did not find how this size has been...
Jul8-12 01:43 AM
32 3,073
I could not find a thread about this (and I hope I don't start a duplicate one :smile:). I got a mail from a friend...
Aug7-14 12:30 AM
4 1,099
They say the universe is 14 or so billion years old. We can observe the early formation of the universe at this time,...
Dec18-07 06:58 AM
1 3,388
If it is indeed true that black holes (eventually) evaporate, then once they lose enough mass do they then return to...
Feb27-08 12:51 AM
2 1,898
I was just wondering. If you imagine that there will be created an very vast and heavy obejct somewhere in the...
Jun23-10 06:05 PM
17 3,014
I have recently been reading Moment of Creation by James Trefil, and I have stumbled upon the question, where has all...
Sep16-08 10:38 PM
3 2,530
Life on Mars? The question is not whether there is life on Mars, but whether life existed on Mars long ago.
Oct5-10 02:30 AM
14 3,367
How do scientists know that the Sun orbits the Milky Way? Is this something more ancient scientists knew or could have...
May17-08 04:17 PM
13 3,837
This could be a question of particle physics, but I just want to see how much we know about this force yet? Any...
Jul22-08 01:04 AM
13 3,160
Traversing our own galaxy is a lifelong quest for me and I am actually pondering it and long for it all the time,...
Jul20-08 03:31 PM
10 2,792
Hello, could someone point out to me 1) Ironclad evidence of correlated light curves - and I mean a correlation...
Sep20-11 10:37 AM
2 1,841
This is related to a HW post I made over in the HW forum. I am stuck trying to find a more detailed formula for the...
Oct23-10 02:11 PM
2 2,910
Since each planet and star has it's own gravity which causes smaller bodies to orbit around them. Will our sun have...
Oct29-07 01:24 PM
10 2,832
that if all electrons orbit atoms, and atoms in the form of moons orbit planets, and planets orbit stars, and stars...
Oct26-07 10:15 AM
3 1,833

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