>the lack of propellant The molybdenum rod IS the propellant. It eventually ends up out in space. I'm only aware of one propellantless thruster, and I'm waiti

>the lack of propellant The molybdenum rod IS the propellant. It eventually ends up out in space. I'm only aware of one propellantless thruster, and I'm waiting to see if it works aboard Barry-1[1] It uses electric power in an entirely closed drive, generating 1 milli-newton of thrust. It should be switched on in a month or two. [1] https://celestrak.org/NORAD/elements/graph-orbit-data.php?CATNR=58338 https://celestrak.org/NORAD/elements/graph-orbit-data.php?CA...