Is antimatter a theory or does it exist?? Does antimatter really exist?? if so, what is it made of, if not matter?? and is it subject to the same laws as normal matter?? i personally cant see how it is possible. in another thread i read that in a void where there is nothing it is possible for matter to emerge from nothing as long as an equal amount of antimatter emerges. i know this is a theory, but has it ever been observed?? i personally think the mass and energy of the universe is unchangeable, but as ever there are differing opinions on this. for it to be unchangeable the antimatter theory must be incorrect as antimatter if it did exist could be composed of antimass, as anything that exists requires mass no matter how small. even light has mass, just a very very very small mass per photon.