NASA Cubesat Mission Powered by Water - Animation

NASA’s Optical Communications and Sensor Demonstration (OCSD) mission consists of a pair of water-powered cubesats. In this animation, "one spacecraft issued a command to the second to activate its thruster and close the gap between the two," according to NASA's Ames Research Center. -- Converts Water into Steam for Propulsion:
https://www.space.com/steam-water-cubesats-dance-in-space.html

Credit: NASA's Ames Research Center