NASA is looking into advanced propulsion techniques to "enable human exploration of the solar system over the next 50 years, and ... interstellar spaceflight by the end of the century." The agency believes that a Quantum Vacuum Plasma Thruster (QVPT) might be the breakthrough system they need. The pool of electromagnetic particles created by the Casimir force would be the fuel for the QVPT. That means that a QVPT doesn't have to carry a fuel source to propel itself onward -- it can generate propulsion through the manipulation of quantum electro dynamics.