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Astrophysics

- The branch of astronomy that deals with the physics of the universe.
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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 68,031
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 45,389
What does it exactly means by the expanding of universe ??? Does everything included in it is also expanding ??
Apr29-13 11:22 AM
Mordred
21 1,517
In discussions of how we infer the existence of dark matter, it always feels like people gloss over how exactly we...
Sep15-08 10:12 PM
Xezlec
4 2,425
Hi, I've been working on a problem involving gravitational lens, and right now I'm trying to learn the formula to...
Sep24-11 02:15 PM
xeorns
0 1,007
If the information we see in space is very old, and the universe "seems" to be expanding, how can we know that it is...
Jan31-13 09:38 PM
Chronos
2 702
Ok, this is something that I've been trying to figure out for a while now. Where does the energy for a supernova...
Jun27-12 08:35 PM
Drakkith
2 719
Recently for a project I have been trying to figure out the correct time to launch a space ship and have it...
Jul3-12 04:13 PM
Janus
1 965
I love Astrophysics. I m preparing for competative exams. It includes making a project on any topic. But it should be...
Aug8-11 08:32 AM
Enthalpy
5 3,483
Hello, I've come looking for advice, direction etc on submitting a proposal to NASA. I emailed their general...
Aug20-07 12:19 PM
RJH8600
13 3,150
Okay, reeling from a defeat in the stellar ring with a self gravitating mass of gas that imploded at a massive...
Dec5-11 10:06 AM
writtenword
2 1,314
I've been reading about this very fascinating experiments there and one thing I can't figure out--either from their...
Jun25-08 02:33 PM
WriterMon
5 1,752
I have been wondering for some time what a Singularity is, I have read it in various places around this forum but I...
Jul29-04 05:41 AM
Dovekie
7 3,786
Hello everyone, I have a problem with my coursework, last part of Q3: Any ideas of how project 3D galaxy...
Nov7-12 03:07 PM
wookie2820
0 1,018
If a neutron star is made solely of neutrons that show no repulsion to each other, protons and electrons have merged...
Nov29-07 06:30 AM
pervect
6 1,483
The post might be in the wrong forum, and it's likely that a similar question has been asked earlier, but I couldn't...
Feb7-13 10:26 AM
marcus
3 674
Is it possible for a galaxy too fall back into its self?(even if they don't) What would happen? :grumpy:
Sep6-05 05:20 AM
SpaceTiger
3 2,525
http://www.science.psu.edu/alert/Chartas11-2000.htm in an earlier thread i asked if it would be possible to...
Oct11-03 11:28 AM
wolram
8 2,711
http://www.ldolphin.org/gentry2.pdf is the universe expanding? not according to this site.
Nov5-03 03:57 PM
Ambitwistor
8 2,870
it is my understanding that if a body is heated its gravity will increase, also if a body is given mommentum its...
Oct21-03 10:45 AM
wolram
11 2,442
some news about the origin of gamma ray bursts, this may be old news to some.there have been many theories for the...
Oct23-03 01:55 PM
Labguy
3 2,923
the search for "gravity waves", is ongoing, i cannot comprehend all the consequences if they are not found, but i...
Oct27-03 05:16 PM
Nereid
14 2,903
4 dec 2003. http://www.physlink.com/News/120403PulsarGravity.cfm A discovery made with CSIRO's Parkes radio...
Dec12-03 05:47 PM
Nereid
3 1,782
does anyone have information about super clusters? will all galaxies eventualy end up in a super cluster? if not...
Jan29-04 02:45 PM
russ_watters
3 1,659
neutron stars seem an oddity to me, they seem to have to much mass to size to be held together purly by gravity do...
May28-04 12:01 PM
Labguy
7 1,395
Can someone tell me which is the favoured theory for planetary formation, core accretion or Gravitational...
Aug3-04 04:59 PM
wolram
7 1,425
http://arxiv.org/pdf/astro-ph/0203330 This paper is 50 pages, and gives a good historical overview for the CC...
Dec2-04 08:46 AM
meteor
1 1,729
For a BH to form it must have a mass boundary, but does this boundary vary with differing types of matter?
Jun7-05 03:47 PM
mathman
5 987
Could the size of our universe be determined by some average per volume temperature ?
Feb8-06 05:21 PM
SpaceTiger
1 1,043
Try talking about astro phys to *the man in the street*, and there is no interest whatsoever, how can this be...
Feb16-06 08:43 AM
DaveC426913
3 1,338
Soon earth bound problems will curtail all asto physical experimentation, funding will be cut to next to nothing,...
Feb15-06 03:47 PM
DaveC426913
2 2,045
http://arxiv.org/abs/astro-ph/0602377.
Feb23-06 01:19 PM
George Jones
6 2,466
http://arxiv.org/abs/hep-ph/0602187 Authors: Edward A. Baltz, Marco Battaglia, Michael E. Peskin, Tommer Wizansky...
Feb23-06 10:55 AM
wolram
0 1,244
http://arxiv.org/abs/nucl-th/0603028 Authors: D.H.E.Gross Comments: 7 pages, 1 figure, presnted at XILV internat....
Mar14-06 11:35 AM
wolram
0 1,170
http://arxiv.org/abs/astro-ph/0604410 Authors: Joao Magueijo, Rafael D. Sorkin Using a variety of...
Apr21-06 01:15 AM
wolram
6 1,412
Has any one thought what physics would be like if, matter and the vacuum were inverted, ie the stars planets ect are...
Apr26-06 01:20 AM
wolram
7 1,421
Are the any? i would think that of all the stars in the u that a few some how broke free from gravity and the...
May24-06 02:57 PM
wolram
8 4,084
Can some one tell me how big an area of influence the lagrange L1, L2 etc points have ? or are they model depandant ?...
Mar9-07 05:52 PM
D H
2 2,597
Can the distance between two bodies be calculated to prove they are gravitationally bound? Use two bodies with...
Jun13-07 07:59 PM
Wallace
3 1,536
http://space.newscientist.com/article/dn13043-milky-ways-two-stellar-halos-have-opposing-spins.html We call it...
Dec22-07 12:20 PM
ray b
9 1,744
arXiv:1103.3688 Title: The Genesis of the Big-Bang and Inflation Authors: R. K. Thakur Comments: 8...
Mar23-11 03:29 AM
Chronos
3 1,440
Take a small bh say 100 sol masses, how long would it take to ingest a Earth size planet?
Jan13-12 10:27 AM
Cosmo Novice
6 1,388

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