"Project Pluto" (Picture I) Kimmo Huosionmaa There would be no motor, what can work without propellant. There is little bit difference between fuel and propellant in rocket technology. Fuel is the thing, what gives power supply for those spacecraft, and propellant is the thing, what gives thrust for the rocket. In the case of electromagnetic or nuclear rockets is very important to separate terms propellant and fuel, because those motors don’t need fire for giving speed for those spacecraft. The so-called impossible motor is one part of so-called electric drive motors, what would use electromagnetic radiation for giving speed for spacecraft. I sometimes wonder, why that team uses microwaves because the radio frequency would be safer, and the system could be cooler. Those motors cannot even work in the atmosphere, because the full thrust force of the electromagnetic radiation is so small. This motor uses electrons or radio-waves as a propellant, and that's why...