Antimatter drive spaceships by an alien planet and its moon, computer artwork. The ringed structures are magnetic containment rings to store antimatter fuel. These theoretical spaceships would produce energy by the total annihilation that occurs when antimatter and matter meet. The efficiency is 100% as all the mass is converted to energy, producing 1000 times the energy of nuclear fission. Travel to the planets and stars would then be feasible. Antimatter is currently formed in small amounts in particle accelerators.