The Space Exploration Vehicle (SEV) is a modular multi-mission vehicle concept developed by NASA. It would consist of a pressurized cabin that can be mated either with a wheeled chassis to form a rover for planetary surface exploration (on the Moon and elsewhere) or to a flying platform for open space missions such as servicing satellites and missions to near-Earth asteroids. The concept evolved from the Lunar Electric Rover (LER) concept, which in turn was a development of the Small Pressurized Rover (SPR) concept.