Galaxy Definition and 510 Threads

I've been reading some books on Galactic Structures and Galactic Evolutions, evidence from rotation curves of stars near the centre of our Milky Way and also M31 suggest that there is a black hole in the centre. But is this true for all galaxies regardless of their Hubble Type? is there a...

Why is it easier to measure overall structure of Andromeda Galaxy than to measure Milky Way Galaxy?

"The nearest galaxy to our own Milky Way has been revealed. It is so close that the Milky Way is gradually consuming it by pulling in its stars. But it will be few billion years before it is entirely swallowed up. The previously unknown galaxy lies about 25,000 light years from Earth and...

Has anybody here read Douglas Adams' The Hitchhiker's Guide to the Galaxy ? I just started the series and am only about 56 pages into it. The whole book is hilarious so far. It's so full of puns, humor, and whim. Has anyone else noticed some subtle parodies to Asimov's Foundation trilogy? Like...

If there were many universes like there are solar systems in a galaxy and like there are many galaxies in the universe, What would you call it?

Greetings ! I thought you may like to know that our galaxy - the Milky Way, apparently has a small settelite galaxy at relativly close proximity. Here's the story: http://www.spacedaily.com/news/milkyway-02a.html Live long and prosper.

Greetings ! I just read Saint's post in the "moving galaxy" thread and though I knew the answer to that, I do not believe I have so far read somewhere an explanation for the existence of the galactic cluster sheets. So, is there a known and recognized reason ? (My guesses : 1. The...

I had come across some scientific articles that Galaxy is actually moving across the space! Is that movement due to initial explosion of the universe? The big-bang? When thing moves, it has energy 1/2M.V^2 , if the galaxy which is so huge is moving, from where does it get the kinetic...

"Skinny" galaxy harbors massive black hole at core http://www.berkeley.edu/news/media/releases/2003/04/10_skinny.shtml What kind of changes to our "rule of thumb" can we expect from this finding?

hi,was the formation of our galaxy inevitable after the BB or could there have been a different outcome, if the former is true then that implies that information or rules were stored pre BB, if the later is true what other outcome could arise. wolram.