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Engineers from Purdue University in US have designed and tested a micropropulsion system called a Film-Evaporation MEMS Tunable Array (FEMTA) thruster that uses liquid water as the propellant for orbital maneuvering of tiny satellites called CubeSats. CubeSats are basically miniature satellites which typically weigh around two kilograms. In the future, they have potential to carry out tasks like imaging and remote-sensing currently performed by the heavier satellites which are expensive to build and launch. CubeSats at present cannot totally replace their larger counterparts as they are incapable of changing orbit or performing complex manoeuvres as they do not have a propulsion  system. If CubeSats would be having system would allow such tiny satellites to correct their orbit or maintain their altitude, thereby prolonging their operating life in space before becoming space debris.