 Astrophysics question
|
|
|
IamSmooth
|
|
Mon Jun 25 2012, 04:33AM
|
|
|
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
|
In so many billions of years the Milky Way and Andromeda will collide. If all galaxies are thought to have started from a single place during the big bang, how can they collide? I would think they are all expanding radially outward from the center away from each other, making a collision not possible. If the answer is that Andromeda is overtaking us, then why are we slowing down?
|
|
Back to top
|
|
|
Sulaiman
|
|
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
|
I suppose it's gravity / interaction of galaxies etc.
like planets around the sun.
Rogue asteroids leaving the asteroid belt etc.
|
|
Back to top
|
|
|
jnbrex
|
|
Registered Member #3950
Joined: Wed Jun 15 2011, 12:45AM
Location:
Posts: 51
|
Because gravity acts more strongly over smaller distances (Gm1m2/d^2) galaxies that are very close together (Andromeda and Milky Way) can overcome repulsion due to dark energy and collide to form a single larger galaxy.
|
|
Back to top
|
|
Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob
|
|
Powered by e107 Forum System
|
