Can anti matter travel any faster than matter? Is their an opposite of c? Would re recognize it if we saw it?
Antimatter is effectively matter with a different change. So a positron is the anti-matter equivalent of an electron. An antiproton is the antimatter equivalent of a proton. In both cases the antimatter particle has the same mass as it matter partner.
Though if I remember right Richard Feynman described antimatter as matter traveling backwards in time - sort of.
Yep - Theory of Positrons
In theory and to the best that we can determine experimentally, antimatter and matter are identical in all respects other than charge.
In principle, entire distant galaxies could be made up of antimatter. They would look and behave no differently. The presence of antimatter would only be obvious if it were in proximity to matter, when annihilation would release a lot of energy.
The ISS has an experiment running designed (in part) to test this notion by looking for antihelium nuclei among cosmic rays.
If something like light were traveling backwards would there be any way to distinquish backwards from simply a different direction?.
Yes; since its speed isn’t infinite, it just has to be noted where a light impulse appears at first.
Do you mean: Does anti matter have mass?
I thought that was what I said until I went back and reread my post.
It has anti-mass!
If that were the case, then, when opposite galaxies collided, they should emit tons of energy (how much exactly I’d dare not speculate, and yes most of the matter in both would NOT collide directly, but would have substantial gravitational effects at least).
Nah, it has perfectly ordinary regular mass.
Sometimes physicists like to posit what would happen if you stick unexpected things in the equations. Negative matter (completely different from antimatter) is hypothetical matter that has negative mass. But it causes all sorts of problems with various energy conditions. (IOW, it breaks the law a lot.) So negative matter probably doesn’t exist.
We’ve observed antimatter, though, so we know it exists. It’s the behaves exactly the same as regular matter in all respects, except its charges are different. So positrons are electrons with positive charge, antiprotons are protons with negative charge. Antineutrons are still neutral, but made up of antiquarks.
Yes, but the absence of such an observation apparently does not definitively rule out antimatter galaxies, given the stated objectives of AMS. I don’t know the theory, but presumably the distribution might be such that collisions between matter & antimatter galaxies (or any detectable regions of annihilation) are rare. It seems that the presence or absence of antihelium nuclei in cosmic rays is the definitive test.
https://science.nasa.gov/science-news/science-at-nasa/2009/14aug_ams
But actually not yet confirmed experimentally.
If gravity pushed it away instead of attracting it could that help to explain why they usually occor on opposite sides of the universe?
I’m curious, no sarcasm intended. Has antimatter actually been proven to exist?
Yes.
Antimatter isn’t something that you run across every day, but is easy enough to generate to be used in medicine (the “P” in PET scan is antimatter.)
Well, damn, I thought a PET scan was when a CAT scan was done on your dog! 
Lets leave aside the idea of opposite sides of the universe - what makes you think that matter and antimatter occur on opposite sides of the universe?