All Questions
19 questions
3
votes
2
answers
79
views
Simulating nebulae
How can we simulate nebulae shapes computationally?
What are the governing equations or forces acting on nebulae? Is it suitable to just use Navier Stokes fluid dynamics and solar winds or is there ...
- 131
0
votes
0
answers
34
views
Does a star that is far from any galaxy tend to rotate slower?
I'm wondering whether the rotation of a galaxy and the buffeting of the gas and dust within it by light and stellar wind and pressure waves makes nebulae or gas clouds in galaxies have more angular ...
0
votes
3
answers
54
views
If the inclination of a cloud of oxygen in outer space is to diffuse, then how do nebulae form?
If a cruise ship-size object in outer space were surrounded by a spherical cloud of oxygen, and there were no other bodies exerting significant gravitational force in the vicinity, would the cloud of ...
- 101
0
votes
0
answers
90
views
Solving coupled integral + differential equations for ionoization and combination of gases near a star
The following set of coupled differential + integral equations appear regularly in the literature (e.g Osterbrock, "Astrophysics of Gaseous Nebulae and Active Galactic Nebulae"):
$ n_H(r) \int_{\...
- 61
0
votes
2
answers
92
views
What conditions provide the oldest star?
If we define the start of the lifetime the protostar and the end of the lifetime a red giant (at max volume), what conditions would make this time the longest when the star was first formed and ...
- 2,700
0
votes
2
answers
80
views
Dark Matter Stars Triggering Nebula Collapse
I'm interested in theories of dark matter where dark matter is an equivalent copy (or copies) of ordinary matter. Each equivalent sector is hidden from the others would see the others as 'dark' and ...
- 1,931
1
vote
0
answers
40
views
Analytical models for planetary nebula expantion
I'm doing an astrophysics project where we measure the properties of a planetary nebula (NGC 7662) where we need to determine it's electronic temperature, electronic density and expansion speed.
I'm ...
- 17
3
votes
1
answer
667
views
What is wrong with our Cloud chamber setup?
A nearly identical question has been asked before on this topic, but that thread did not help us any further.
Me and a classmate built a cloud chamber in order to see elementairy particles (we aren't ...
0
votes
1
answer
144
views
Nebulas and Ideal Gas Equation confusion
I was wondering how stars form and watched this video:
https://youtu.be/mkktE_fs4NA?t=18s
The lady says:
"Gravity brings matter together. And when you bring matter together,
when you squeeze ...
- 101
1
vote
1
answer
326
views
Would an HI or HII region have a color?
That is, if we were approaching an HI or HII region in a spaceship, would the cloud have a color visible to the naked eye? Of the HI region, Wikipedia says:
These regions do not emit detectable ...
- 153
0
votes
2
answers
1k
views
Angular momentum, its conservation and Nebula theory
I am carrying out a research work and I am stuck at the first page where there is an introduction to the angular momentum and its relationship in the formation of the solar system.
According to that ...
- 35
1
vote
0
answers
190
views
If entropy is positive, then why do stars form from nebulae?
Sorry if I have so many misconceptions with this questions, but I guess that's the point of asking questions.
If entropy, the measure of disorder, is always positive, then how come a star could form ...
- 27
3
votes
2
answers
1k
views
Why isn't all of the dust in a nebula used in the formation of a star?
I was watching a show on discovery and according to it, in a nebula the dust and gases slowly come together and as the gravity increases and the pressure rises in the core the gases fuse together and ...
- 2,261
4
votes
1
answer
147
views
Could a bipolar nebula be produced by a time gradient?
M2-9 is an example of a bipolar nebula that resembles two back-to-back rocket nozzles. Is it possible that this shape (somewhat unusual for an explosion) is the result of a time gradient? A rotating ...
- 51
2
votes
2
answers
107
views
Distinguishing Gamma-rays and stars from each other in nebulas
How do you tell the difference between a gamma-ray burst and a star just from a picture of a nebula, in which it cannot flash on and off here and there?
- 31
6
votes
4
answers
2k
views
How is it that some nebulae are rotating and others are not?
First, I should make it clear that this isn't a question about angular momentum (unless I may have completely missed something). It is my understanding that a nebula must have some inherent initial ...
Nate
12
votes
4
answers
3k
views
Names, maps for Milky Way dust clouds? (Dark Cloud Constellations)
There is a nice image of the Milky Way, labeled with constellations, at 360°x45° panorama with constellations:
It leads me to wonder how much we know about the Great Rift, Coalsack and other ...
- 451
5
votes
1
answer
198
views
How are new nebulae being created?
The nebulae we see in the night sky are forming new stars.
The stars are eating up the nebulae and there is no obvious process in which those nebulae are being created to compensate for that.
...
Hermann Ingjaldsson
23
votes
2
answers
14k
views
How dense are nebulae?
How functionaly dense are nebulae? Are they so sparse they are only visible from an interstellar or intergalactic perspective or would you be unable to see your hand in one?
Do they vary widely in ...
Suni