PROTEUS (acronym for Reconfigurable Platform for Observation, Telecommunications and Scientific Uses) is a 3-axis stabilized platform designed for mini-satellites weighing approximately 500 kg operating in low Earth orbit. The platform is used by six scientific satellites developed as part of the space program of the National Center for Space Studies (CNES) for the European Space Agency: Jason-1, 2 and 3, CALIPSO, CoRoT, and SMOS. The platform is developed by the satellite division of Aérospatiale (in 2016 Thales Alenia Space).