In the end, we flew a Bic lighter in space. Because SNAP 1 had to be built quickly and cheaply, the propulsion fuel had to be loaded in Surrey before the satellite was shipped to Russia for launch. The safety of butane Hydrazine and ammonia were considered too toxic, although ammonia might be used in future systems, Ward said. That left propane or butane as possible thruster propellants because the required amounts could be carried on a tiny satellite at low pressures, Ward said. Butane was chosen for its safety.
Butane is a decidedly low-tech way to power nanosatellite thrusters.
The latest plans to bring Mars rocks back to Earth.