Register to Post Thread

Astronomy & Astrophysics

- Celestial objects, space, and the physical universe as a whole.
RSS Feed Icon
Meta Thread / Thread Starter Last Post Replies Views
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
marcus
140 114,160
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 45,263
Hydrogen and Helium were the main constituents formed soon (thousands of years?) after the big bang. Why did they not...
Jul18-03 04:54 PM
Phobos
6 1,828
I just finished watching a few Stephen Hawking specials. I watched "Did God create the universe" and the one about...
Sep27-12 01:10 PM
Ravi Mandavi
9 1,576
Hi all, I have read this article about Saturn rings: http://www.space.com/news/ap-071213-saturn-ringage.html ...
Dec17-07 12:12 PM
mgb_phys
3 1,773
I did some research in regards to the age and metallicity of population I stars in hopes to come up with a novel...
Dec5-08 08:45 AM
Arch2008
1 3,834
Hi New on here and wanted to show my stupidity by asking a question that is perplexing me and hoped you could help...
Oct30-09 04:54 PM
rafdaddy
7 2,239
The Solar System is traveling around 155 miles a Second around the Milky way Galaxy. There are 31,556,926 seconds...
Jul11-06 09:43 AM
Orion1
10 2,591
I'm always perplexed by the numbers I see on estimates of the age of the universe and the age of our solar system....
Apr28-09 07:19 AM
curiousOne
6 3,186
Please can somebody explain how the age of the universe can be determined using Hubbles Constant? If the constant is...
Nov13-03 04:20 PM
Ambitwistor
3 1,566
Assuming it has only been recently discovered that the expanding universe is expanding at an accelerated rate, and...
Jan20-10 06:04 PM
qraal
2 948
When the media report on distant objects and state that the light from that distant object was emitted 10 billion...
May9-03 11:48 PM
russ_watters
7 1,652
Question When astronomers find a new star, say 15 billion light years away, why do they immediately relate that...
Feb2-04 05:20 PM
Phobos
5 2,451
Hi All, how is the age of universe calculated ? i read a few articles/wiki etc and its estimated to be roughly...
Oct21-09 06:33 AM
Chronos
4 1,841
Something that always got me thinking about is time is relative to the speed of the object (time dilation) how can we...
Apr3-09 11:37 AM
flyway
10 2,528
I'd be interested to hear people's comments. One thing especially. The current estimates are of the order of 20bn...
Apr11-04 09:40 PM
Nereid
9 2,326
Hi. i have a question that could already been nullified. Reading about the CMB it occurred to me that normal light...
May23-10 09:58 AM
Fredrik
9 2,048
Hi all, This is my first endeavor into the astronomy forum. I have a question, regarding three things I think I...
Nov23-09 09:31 PM
dilletante
17 3,001
I've been searching inliterature/trying to solve on my own this dilemma: What is the mathematical relation that...
Jun27-11 01:41 PM
randa177
3 2,496
why is getting the age from CMD more accurate than getting it from photometry?
Feb20-09 09:59 AM
randa177
7 1,780
I have read on a NASA website amongst other places that "Many astronomers believe that Seyfert galaxies and...
Dec18-09 07:22 AM
kop442000
0 821
I've got a small homework question that goes: Which would be more dangerous and why: Eta Carina exploding as a...
Dec19-09 12:12 AM
Chronos
4 1,854
Hello, In one of my lectures that I had a few weeks ago, the lecturer was talking about Active galactic nuclei, he...
Jan8-07 10:57 AM
ppyadof
0 1,686
Great pointers Dave, that will be easy to find. Perseus is not that hard to see. It is one of the circumpolar...
Nov14-07 09:46 PM
Integral
5 1,738
This is relevant to solar astronomy, defining the edge of Sol's supremacy as the overwhelming provider of all light...
Mar2-05 09:18 AM
Eridanus1
0 1,425
..sucks. I have the Sky-Watcher 10" dob (got it for xmas). All around, it's a great scope for the cost, and produces...
Mar4-10 06:21 PM
turbo
10 2,015
i am trying to learn AIPS in preparation to doing research in radio astronomy. I know the basics of radio astronomy...
Sep13-12 02:47 PM
chemisttree
1 1,519
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
gm5170
6 1,049
How would I come up with an equation (in one dimention), for the airy pattern of a telescope with a given diameter...
Oct12-10 02:06 AM
Chronos
1 1,307
Hi all, I need to get an aitoff all sky flux map. I have flux given by an equation that depends on different...
Dec28-09 03:34 PM
manjeet85
0 2,331
Hello guys, sorry to be a bother but I'm currently undergoing the assessment for Galaxies, Stars and Planets, and for...
Mar7-14 01:33 AM
Illogical
2 1,010
It is an interesting topic and Alan Guth had two papers discussing it in 2003, also Hawking had one I found in 2003....
Feb2-04 03:08 PM
marcus
0 4,630
It was my understanding that one of the reasons for Inflationary Theory was to address The Smoothness Problem. ...
Nov7-03 07:50 PM
Ambitwistor
3 2,547
Hi all, I'm looking for a way to calculate how much light is reflected from the surface, on the moon, and whether...
Nov4-07 10:31 AM
DaveC426913
8 6,739
Hello, What do Alfven waves look like? Say you have a spherical galaxy. What would the Alfven waves of the three...
Jan14-12 07:10 PM
sparkle123
2 1,456
One of the all-time great science mysteries is now a step closer to explanation. The surface of the sun, known as the...
Jul31-11 06:27 AM
Dotini
2 1,967
I am realy quite terrible at rearranging equations, I wonder if anyone could help? How can I rearrange :...
Jun9-09 10:21 PM
Chronos
6 1,594
alien, life Alien life ( 1 2 3 ... Last)
What do you guys reckon to the odds of us finding alien life? The fermi paradox: 'If there are all these billions...
Apr25-11 11:35 AM
berkeman
78 10,080
Cool. http://arxiv.org/abs/0905.3742 Abstract: To simulate the kinds of observations that will eventually be...
May25-09 07:48 PM
marcus
0 1,256
Do you think that they will ever contact us or vice versa? I can`t believe that with all the Trillions of planets...
Jul7-03 10:51 AM
Ace-of-Spades
64 6,042
Mapping extreme-scale alignments of quasar polarization vectors Accepted by Astronomy & Astrophysics; 19 pages, 17...
Oct31-05 01:01 PM
CarlB
0 1,196
okay so here are the lengths of years and days on the planets: Mercury: Day: 176 earth days Year: 88 1 year on...
Feb7-14 06:04 AM
phyzguy
9 1,915

Register to Post Thread
Bookmark and Share

Display Options for Astronomy & Astrophysics Mentors
Showing threads 321 to 360 of 9613 Mentors : 2
 
Forum Tools Search this Forum
Search this Forum :
 
Advanced Search