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HELPFUL DESCRIPTIONS. a : semimajor axis For elliptical orbits, the semimajor axis is half the length of the...
May2-10 02:49 PM
Jenab6
45 68,090
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 45,433
One of the most popular mass loss equations of a star, developed by D. Reimers, is given by: dM/dt = -(4x10^-13) *...
Nov15-13 01:56 PM
D H
1 1,107
Hi everyone. This isn't a specific homework problem, I'm just trying to understand a concept. I've been studying...
Oct28-13 11:52 PM
mfb
1 862
Space is endless, I mean the 'real space' outside our universe. Our Universe is said to be about 13.7 billion years...
Nov14-13 07:28 AM
tiny-tim
6 1,104
There's very little known about WIMPs, from my understanding, but I believe there has been some speculation that they...
Nov13-13 05:36 PM
mathman
3 925
Hello to all! I'm trying to develop a routine (in ESO-MIDAS) similar to NEAT (Nebular Empirical Analysis Tool) or...
Nov13-13 02:51 PM
faeriewhisper
0 841
What was the primordial composition of U isotopes in solar system? Solar system contained isotopes less than a...
Nov25-13 08:58 PM
Chronos
23 1,994
how many dimensions are there in universe and what are they ?
Nov15-13 08:31 AM
bapowell
4 939
Hi guys, Simple question for my first post. If nothing escapes Black Holes, how come they're such massive...
Nov20-13 07:42 PM
Drakkith
4 1,063
Hello everybody, I'm new here and i have a question about the activity of our galaxy's Supermassive Black Hole. Did...
Nov20-13 06:59 PM
Chronos
2 860
A recent APOD page discussed jets ejected from black holes. It said, "Recent evidence indicates that these jets are...
Nov25-13 12:22 AM
WSTrood
7 940
I want to calculate the delta V needed to move objects around in a 1-d gravitational field. The relevant equations as...
Nov28-13 03:56 PM
BobG
1 905
Can they exist? What happens when an antimatter black hole and a normal black hole collide?
Nov26-13 06:40 AM
bahamagreen
14 1,227
This paper, http://arxiv.org/abs/1311.6806, discusses Kepler mission results. The authors deduce that 5.7% of sun-like...
Dec1-13 05:34 AM
Damo ET
9 1,255
Hello, everyone. On physics Olympiad in our country I get a interesting example... But, I didn't know how to solve...
Dec1-13 04:40 AM
snorkack
1 854
Hi, I'm basically wondering why there is any residual angular momentum in the universe left over from the big bang...
Dec1-13 10:45 AM
mfb
1 932
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
10 748
I've read that the temperature of the CMBR is 2.7 degrees K or so and is much cooler than when it started out, due to...
Feb1-14 11:02 PM
marcus
2 546
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
3 538
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
3 627
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
5 762
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
4 759
Primordial black holes as a dark matter candidate has been ruled out -...
Mar15-14 10:55 PM
Chronos
11 802
say you measured every particle which has entered a black hole say you measured every hawking radiation particle...
Mar16-14 06:23 PM
acesuv
4 740
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
1 420
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 1,175
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
13 776
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
3 582
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
9 742
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
2 467
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
4 625
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
1 485
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
3 645
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
2 521
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
1 536
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
12 675
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
6 526
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
5 441
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
2 221
Can gravitational attraction (generated by a super-massive black hole, for instance) accelerate you faster than c?
Apr20-14 09:38 AM
Mordred
10 338
So, I was disappointed to find out that the surface of a neutron star is at 1 million kelvin, not 100 billion kelvin....
T 05:18 PM
jlefevre76
10 315

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