How exactly are galaxies formed?

[Radical Edward]

supermassive black holes don't need supernovae to form. stick in the numbers and it turns out that the density required to form a supermassive hole is actually very low.

 

oh, and the counterclockwise thing is also pointless on accoun of the fact that coordinate systems are arbitrary, and you can look at the galaxy spinning from either side.

 

our neighbour, Andromeda is an awful long way away.

I don't think it is heading in this direction either.

[YoungStrife]

Yes...it is. In around 1 billion years and counting.

 

(Bill, back me up on this one..I saw it on discovery and discovery science hehe)

[Radical Edward]

indeed:

 

"... Appearing as a smudge of light to the naked eye in the constellation Andromeda, this galaxy is about twice as big as the Milky Way but very similar in many ways. At the moment it is about 2.2 million light years away from us but the gap is closing at 500000 km/hour. Andromeda is the only big spiral galaxy galaxy moving towards the Milky Way and the best explanation is that the Milky Way and Andromeda are in fact a bound pair of galaxies in orbit around one another. Both galaxies are thought to have formed close to each other shortly after the Big Bang initially moving apart with the overall expansion of the universe. But since they are bound to one another, they are now falling back back together and one very plausible scenario puts them on a collision course in 3 billion years. ..."

 

source: http://www.innerx.net/personal/tsmith/AGN.html

 

the rest of what you said was still nonsensical though

[YoungStrife]

Thank you. I heard supermassive black holes most likely form from sgiant supernovae, but then I heard another saying that black holes actually feed on stars, meaning they grow in size as stars are sucked in. Untill I heard this I thought they only shrink in size over time..but oh well. Who cares

 

So galaxies form from lots 'o' gas..yehe