Are There Antimatter Galaxies?

I believe that the terms matter and antimatter are definitions arbitrarily made. The positron is deemed antimatter and the proton matter. Matter and antimatter annihilate when they come into contact yet a positron doesn't annihilate a proton because they're kept apart by the great repulsive electrostatic forces between them. This makes a mockery of the terms matter and antimatter. The only particles that can be called matter and antimatter are the electrons and the positrons. Everything else are composites of these particles. You could say that composite matter is made of matter and antimatter.

At first glance, I read "Are there anticlimactic galaxies?" Which, considering we're talking stellar bodies, would have to be the saddest of all possible galaxies.

Oooh, antimatters... that's a really good name for a show, or a band. I'll totally come up and shoot a run of videos at SFU. Let's schedule a time, and we'll come do it. :-)

Hey Fraser, in terms of other mysteries of matter, perhaps a look at the possibility of exotic matter stars (quark stars) if there isn't already a past episode I didn't note. Also, saw your vid with Howard Trottier with space hangouts. I'm one of the volunteers at the new observatory at SFU. Perhaps a great backdrop for a future episode of Guide to Space when you make a visit out this way! (Just put on a new planetary imaging camera). Lastly, perhaps title for a new space talk show - Anti-Matters? Ha! Always love your videos, Fraser! Thanks for making SPAAAACE that much closer.