A space simulator is a system that tries to replicate or simulate outer space an/or the experience of space flight in a spacecraft as closely and realistically as possible. This includes full-size cockpit replicas mounted on hydraulic rams, controlled by state of the art computer technology or elaborate watertanks for simulation of weightlessness. Space flight simulators are used almost solely by the aerospace industry and the military for cosmonaut/astronaut training, disaster simulation and spacecraft design.