Antimatter galaxies?

[Rev. Green]

Why is the amount of matter and the amount of antimatter though to be different? Couldn't the local group of galaxies be just a "minor", local fluctuation ( of 10^40 tonnes!) in the amount of matter?

[R1Geezer]

A all the matter/antimater was close enough to annihilate just after the big bang. What is left is just the tiny surplus of matter over antimater.

[jake-the-peg]

Yes Rev I think that's possible.

Of course individual galaxies are colliding all the time. If a matter and antimatter galaxy were to collide we'd probably notice!

Given this and the sheer number of galaxies out there I'd probably bet against anti-matter galaxies but I'd not exactly be amazed if we caught a collision between a matter and anti-matter galaxy