Astrophysics question
IamSmooth, Mon Jun 25 2012, 04:33AMIn 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?
Re: Astrophysics question
Sulaiman, Mon Jun 25 2012, 06:02AM
I suppose it's gravity / interaction of galaxies etc.
like planets around the sun.
Rogue asteroids leaving the asteroid belt etc.
Sulaiman, Mon Jun 25 2012, 06:02AM
I suppose it's gravity / interaction of galaxies etc.
like planets around the sun.
Rogue asteroids leaving the asteroid belt etc.
Re: Astrophysics question
jnbrex, Mon Jun 25 2012, 07:06AM
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.
jnbrex, Mon Jun 25 2012, 07:06AM
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.
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