/sci/ - Science & Math

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Anonymous Sun Mar 20 23:58:57 2011 No.2745422 [Reply] [Original]

Why is the galaxy spiral shaped?

So I was watching the whirlpool in the aftermath of the earthquake, and wondered why the milky way galaxy takes that shape.

Pic related, the solar system.

>>	Anonymous Mon Mar 21 00:02:57 2011 No.2745435 You answered your own question: because it spins.

>>	Anonymous Mon Mar 21 00:03:57 2011 No.2745441 >>2745422 >solar system Failtroll.

>>	Anonymous Mon Mar 21 00:04:57 2011 No.2745443 >>2745441 Could be from /b/ though.

Anonymous Mon Mar 21 02:05:57 2011 No.2745935

it has to do with conservation of angular momentum.

so.. galaxies start out as giant balls of gas and dust. some shit clumps together by mutual gravitational attraction and the "center" is formed. the other shit "falls" toward the center and what isn't snatched up by the actual center's mass starts orbiting. as these orbiting clumps take shape and become more massive, mutual gravitational interaction with the "center" increases and the orbits contact. as this happens, conservation of angular momentum dictates that the angular velocity of orbiting bodies must increase. as this happens, faster moving bodies sweep up more leftover shit and two things happen.. the planar deviation of different orbits decreases and gravitational attraction between bodies increases; stabilizing the overall shape of the galaxy.

tldr; fuckin galaxies, it's how they work

Anonymous Mon Mar 21 02:13:57 2011 No.2745970

Honestly, one of the great scientific mysteries of the world. Nobody knows for sure, but people will instantly spout theories of "gravity" and "hawking radiation" to try and explain it, though really they're just guesses. At least it's better than "lol GOD DID IT" (as an atheist a general rule of thumb I follow is to punch someone in the face every time they mention god or religion)

>>	Anonymous Mon Mar 21 02:17:57 2011 No.2745991 >>2745970 >>of the world >>galaxy...

>>	Anonymous Mon Mar 21 02:19:57 2011 No.2745999 >>2745970 yeah because the only way to prove your intellectual prowess is to punch someone in the face when they mention something you don't agree with.

>>	Anonymous Mon Mar 21 02:38:57 2011 No.2746083 >>2745935 >>and the orbits contact >>contact *contract fixd sorry

>>	Anonymous Mon Mar 21 02:45:57 2011 No.2746105 File: 39 KB, 554x437, 9991298215233865.jpg [View same] [iqdb] [saucenao] [google] >>2745970 >Nobody knows for sure You are fucking retarded? You can derive the shape of galaxies using General Relativity dumbshit. It isn't a fucking mystery!

>>	Anonymous Mon Mar 21 02:47:57 2011 No.2746112 >>2745970 This post is bad and you should feel bad.

>>	Anonymous Mon Mar 21 02:47:57 2011 No.2746111 Total guess: the sun's gravitational pull is not equal on all sides so maybe the center of the milky way mimics this? Or by chance more matter was thrown out on one area and the gravity of these bodies created the spiral shape? theory crafting

>>	Anonymous Mon Mar 21 02:48:57 2011 No.2746123 >>2746105 THEORY of general relativity

Anonymous Mon Mar 21 02:48:57 2011 No.2746125
File: 55 KB, 600x672, 1e736c0363b6030be50e9aa0866524e6.jpg [View same] [iqdb] [saucenao] [google]

>>2745422
>Why is the galaxy spiral shaped?

You can derive all that shit from general relativity, it is probably way over your head though. But, yeah, we know exactly why they are shaped that way.

\thread

>>	Anonymous Mon Mar 21 02:50:57 2011 No.2746128 >>2746123 > THEORY > doesn't know the meaning of this word in scientific context You're a fucking retard.

>>	Anonymous Mon Mar 21 02:50:57 2011 No.2746134 >>2746123 > THEORY HERPA DERP DURRRRRRRRRRR

>>	Anonymous Mon Mar 21 02:52:57 2011 No.2746147 A supermassive black hole exists in the the centre, spiralling matter towards it.

>>	Anonymous Mon Mar 21 02:52:57 2011 No.2746149 File: 115 KB, 300x400, 1278009975941.png [View same] [iqdb] [saucenao] [google] >>2746134 >>2746128 /sci/: easiest trollin' since Jesus rose to heaven 2000 years ago.

>>	Anonymous Mon Mar 21 02:52:57 2011 No.2746150 >>2746123 Holy shit man, go back to /b/

>>	Anonymous Mon Mar 21 02:53:57 2011 No.2746155 >>2746149 > insert uneducated opinion > get caught > LOL TROLLLL Retards.

>>	sage sage Mon Mar 21 02:53:57 2011 No.2746157 File: 15 KB, 476x485, 1273752327639.png [View same] [iqdb] [saucenao] [google] >>2746123 Yes, a very very very very accurate theory. The theory predicts spiral galaxies, and we fucking see spiral galaxies.

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