Multiple thruster chips on a single silicon wafer, seen during production in Nanospace’s cleanroom in Uppsala, Sweden. Elements such as flow channels and sensors, chamber and nozzle are fitted into a 1x2 cm chip, just 1 mm thick, by using microelectromechanical systems technology, otherwise known as MEMS. In terrestrial terms, MEMS is already a very mature technology platform: there are such devices all around us, in our cellphones, watches and cars.