> For an alternative, I've heard some good things about laser ablative thrusters. kepler also had thrusters, for desaturing the reaction wheels. took at least

> For an alternative, I've heard some good things about laser ablative thrusters. kepler also had thrusters, for desaturing the reaction wheels. took at least half an hour or something every few days, i think. thrusters spew stuff into the local environment, cloudying it up (relatively speaking). so it might not have been a solution for kepler, even if you could pack on the necessary reaction mass.