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" ... 3.) Antimatter fuel. If we’re going to bring fuel with us, we might as well make it the most efficient fuel possible: matter-antimatter annihilations. Rather than chemical-based or even nuclear-based fuels, where only a portion of the mass brought on board gets converted to energy, a matter-antimatter annihilation would convert 100% of the mass of both matter and antimatter into energy. This is the ultimate in efficiency for fuel: the prospect of converting all of it into energy that could be used for thrust. ... "
" ... Ask anyone — even someone with no background in science — to name something that Einstein did, and odds are they’ll come back with his most famous equation: E = mc². In plain English, it tells us that energy is equal to mass multiplied by the speed of light squared, teaching us an enormous amount about the Universe. This one equation tells us how much energy is inherent to a massive particle at rest, and also tells us how much energy is required to create particles (and antiparticles) out of pure energy. It tells us how much energy is released in nuclear reactions, and how much energy comes out of annihilations between matter and antimatter. ... "