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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
20 45,266
HELPFUL DESCRIPTIONS. a : semimajor axis For elliptical orbits, the semimajor axis is half the length of the...
May2-10 02:49 PM
45 67,872
I have made available lecture notes presented by Richard Feynman at the Hughes Research labs on the topics of...
T 09:02 AM
0 47
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
2 151
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
1 201
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
75 1,427
Greetings, The IceCube neutrino detector array in the antartic is a cubic kilometer and has deceted about 28...
Apr16-14 06:15 PM
4 253
My question is based on two theoretical assumptions. 1) The universe continues with its expansion resulting in an...
Apr16-14 09:02 AM
3 251
Hi all, I am nearing the start of my final year at university and part of that year is a large research project on...
Apr14-14 10:03 AM
2 501
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
5 574
Dear friends, I am writting a simple essay about the mechanisms of scientific evolutions, where I would like to...
Apr11-14 03:07 PM
3 220
Since light has no MASS............ Then how does a black hole absorb light?
Apr11-14 02:19 PM
7 262
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
2 146
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
17 649
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
4 430
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
5 786
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
12 598
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
5 386
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
4 701
The escape velocity of a satellite circularly orbiting a large body comes from conservation of energy. Are there any...
Apr3-14 02:15 PM
6 455
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
1 476
When I linked to this morning's, I read the following, which appears to be a notable disturbance of...
Mar31-14 05:23 AM
1 361
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
5 708
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
9 671
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 1,094
I realize that there are no lakes or rivers on Venus, but, given the surface temperature, pressure, etc. what...
Mar21-14 05:00 PM
4 566
I have been informed about the rules of the forum, that the administrators strongly encourage members to make an...
Mar21-14 03:21 PM
2 416
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
3 581
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
1 431
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
2 410
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
3 571
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
13 709
say you measured every particle which has entered a black hole say you measured every hawking radiation particle...
Mar16-14 06:23 PM
4 676
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
10 681
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
3 475
Primordial black holes as a dark matter candidate has been ruled out -...
Mar15-14 10:55 PM
11 736
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
9 1,248
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
24 2,510
I'm trying to understand this one. Let's imagine we want to launch a satellite to the...
Mar8-14 08:00 AM
2 588
This paper;, Resonantly-Produced 7 keV Sterile Neutrino Dark Matter Models and the...
Mar7-14 10:28 PM
6 852
Consider any of the latest maps of the temperature fluctuations of the CMB. Such a map can be considered a 2...
Mar6-14 11:06 AM
2 762
I have a Physic 201 understanding of physic. I understand that the most distant star (galaxy) that we can see...
Mar6-14 02:47 AM
5 750

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