Author Topic: Galactic Lecturehall  (Read 2949 times)

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Offline ElementCoder

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Galactic Lecturehall
« on: April 09, 2013, 04:55:57 pm »

So I don't know if this thread will even live for more than a week, but I'll try to gather some simple yet fascinating (in my opinion at least) facts about astronomy and the universe. It'll probably (not yet) be very high level complicated stuff,  but that will come later. So yeah, if anyone has some questions you can always ask and I'll see if I can help you out (of course you can help too :P).
Note: throughout these derivations you may think "why is he doing that?" or "why does he discard that?". The reason is because we make a few simple assumptions that make our lives a whole lot easier. Stars, matter clouds and galaxies for example are all 'perfect spheres'; stars are only hydrogen (though that may vary depending on what I'm derivating / showing).

Gravitational Collapse:
Condition 1: The cloud is larger than its Jeans length
Spoiler For Jeans length for a 3 dimensional cloud:


Condition 2: The cloud is heavier than its Jeans mass

Orbital mechanics (simple):
Spoiler For Orbital Veloctiy:

Spoiler For Escape Velocity:

« Last Edit: May 10, 2013, 09:06:40 am by ElementCoder »

Some people need a high five in the face... with a chair.
~EC

Offline aeTIos

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Re: Galactic Lecturehall
« Reply #1 on: April 12, 2013, 06:50:57 am »
Aha. Well you said you derived the equation for when a cloud of dust collapses into a star, canz you post it?
I'm not a nerd but I pretend:

Offline ElementCoder

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Re: Galactic Lecturehall
« Reply #2 on: April 12, 2013, 11:14:06 am »
I've put up the length for which it collapses and will put up the mass probably tonight and somewhere this week the versions for a two-dimensional cloud.

Some people need a high five in the face... with a chair.
~EC