Science-fiction movies and TV shows often refer to antimatter propulsion drives. This is not as far-fetched as it may seem. In a matter-antimatter annihilation event, a particle and its antiparticle annihilate each other and release all of their mass energy (such as in the reaction p+p→2γ, for example). How many of these matter-antimatter annihilation events are needed to get our kWh of energy? And what is the total mass of protons and antiprotons required to do this? Hint: The antiproton has the same mass as that of the proton, 938.3 MeV/c2 = 1.6726ï10-27 kg. I'm not great with the whole concept of anti-matter, any help please? Such as equations to use and general concepts?