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To help me in understanding this procedure, I read the fifth chapter of THE DETERMINATION OF ORBITS by A. D. Dubyago,...
Apr22-12 12:10 PM
Drakkith
20 45,425
HELPFUL DESCRIPTIONS. a : semimajor axis For elliptical orbits, the semimajor axis is half the length of the...
May2-10 02:49 PM
Jenab6
45 68,078
The bullet cluster remains controversial, as evidenced today by http://arxiv.org/abs/1404.5633 and...
T 09:46 AM
phyzguy
3 148
Hi, I don't know if I am in the right sub forum or if this topic has been discussed but I'll ask anyway. so I don't...
Apr22-14 10:33 PM
berkeman
7 892
Since light has no MASS............ Then how does a black hole absorb light?
Apr21-14 02:57 PM
berkeman
14 531
Is there an estimate of how long after the big-bang could a solar system similar to ours (ie star and orbiting...
Apr20-14 07:26 PM
Mordred
1 338
So, I was disappointed to find out that the surface of a neutron star is at 1 million kelvin, not 100 billion kelvin....
Apr20-14 05:12 PM
Matterwave
7 297
Hi all, I am nearing the start of my final year at university and part of that year is a large research project on...
Apr20-14 12:38 PM
CharlesMichael
3 580
Can gravitational attraction (generated by a super-massive black hole, for instance) accelerate you faster than c?
Apr20-14 09:38 AM
Mordred
10 337
Hi, what is the name of the variable star with the longest period? I know Mira variables are in general the longest,...
Apr17-14 09:12 PM
mishima
2 219
The two mass is similar. I read a line about this and i thought L should be conserved before. What is the background...
Apr17-14 09:54 AM
Simon Bridge
1 272
In the past I have tried to start threads that provide surprising insights into the processes that set the luminosity...
Apr16-14 08:21 PM
Drakkith
75 1,691
Greetings, The IceCube neutrino detector array in the antartic is a cubic kilometer and has deceted about 28...
Apr16-14 06:15 PM
Tobychev
4 334
My question is based on two theoretical assumptions. 1) The universe continues with its expansion resulting in an...
Apr16-14 09:02 AM
bapowell
3 323
Apologies for a long preamble. There is a simple question at the end of this post. Wikipedia and the PF archive were...
Apr13-14 12:45 PM
D H
5 629
Dear friends, I am writting a simple essay about the mechanisms of scientific evolutions, where I would like to...
Apr11-14 03:07 PM
jedishrfu
3 277
Some article made mention of intense radiation on Mars. Does that mean Mars lacks a magnetosphere? I figured it would...
Apr11-14 12:39 PM
Bill_K
2 208
Hey guys, I feel like an idiot for asking this. However, I wanted to make sure that my head was screwed on...
Apr6-14 10:12 PM
Ken G
17 729
when we draw a mass-time graph of a star in x-axis as time and y-axis as mass whether it will be linear or not?
Apr6-14 09:17 PM
Ken G
4 486
Hi, does anyone know how much of the universes's iron or carbon has been made in supernovae that formed black...
Apr6-14 11:31 AM
Ken G
5 849
Hello all, I have a question on cosmic redshift and I am really hoping that one of you can solve this for me, as...
Apr6-14 11:00 AM
Ken G
12 671
A few years back I started a thread to make the point that there is a common misconception about main-sequence stars...
Apr6-14 05:15 AM
D H
5 439
Hi everybody! I have been asked by the astronomy group at my campus to do one of a series of talks on basic...
Apr4-14 11:02 PM
Ken G
4 757
The escape velocity of a satellite circularly orbiting a large body comes from conservation of energy. Are there any...
Apr3-14 02:15 PM
D H
6 524
Lets say we have a couple objects, one very close to a black hole, one a little farther out and then one a good...
Apr1-14 01:51 AM
Simon Bridge
1 531
When I linked to this morning's spaceweather.com, I read the following, which appears to be a notable disturbance of...
Mar31-14 05:23 AM
willem2
1 419
Hi. I need help please with a textbook illustration that has confused me. Is the caption a typo? Should be...
Mar30-14 06:22 PM
bluejello
5 760
Imagine a spinning skater. She pulls her arms in a little and spins faster. She brings her arms all the way into her...
Mar29-14 05:21 AM
phinds
9 740
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
delsaber8
13 1,173
I realize that there are no lakes or rivers on Venus, but, given the surface temperature, pressure, etc. what...
Mar21-14 05:00 PM
snorkack
4 623
I have been informed about the rules of the forum, that the administrators strongly encourage members to make an...
Mar21-14 03:21 PM
Janus
2 518
Why aren't the other bands (visible, UV, etc.) in the electromagnetic spectrum also seen today as part of the...
Mar21-14 12:15 PM
abitslow
3 644
If the B-mode sky plots could be Fourier transformed what would be a plot of the lowest order B-mode harmonic plotted...
Mar20-14 09:12 PM
Spinnor
1 482
Hi. My name is abi. I was wondering if anyone knew how to remove pupil ghost from images using the rmpupil command in...
Mar20-14 02:53 PM
abbeynewton
2 466
A supernova core collapses and the rest of the star follows, inner layers arrive first, a shock wave wave forms? As...
Mar20-14 02:43 PM
Spinnor
3 626
Hello, I was wondering that I'm a astronaut on Moon and I thought about a one question... If I look at the Earth...
Mar17-14 12:17 PM
Numeriprimi
13 774
say you measured every particle which has entered a black hole say you measured every hawking radiation particle...
Mar16-14 06:23 PM
acesuv
4 739
Hi everyone! First of all, I'm a brand new member and am looking forward to spending time on this forum, learning a...
Mar16-14 03:36 PM
phyzguy
10 747
This article mentions moon dust as "subjected to a millenia of UV radiation" as if it's a bad thing. UV would simply...
Mar16-14 02:01 PM
D H
3 537
Primordial black holes as a dark matter candidate has been ruled out -...
Mar15-14 10:55 PM
Chronos
11 800
Hi, I'm new to the forum, and didn't really know where else to ask some questions, and get good answers, I'm fairly...
Mar15-14 08:20 AM
rocket123456
9 1,306
I was arguing today with a friend and the argument seemed pretty pointless because we had nothing to back up our facts...
Mar10-14 03:01 AM
julcab12
24 2,645

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