Orion (spacecraft)

The Orion Multi-Purpose Crew Vehicle (MPCV) is a partially reusable crewed spacecraft used by NASA for the Artemis lunar exploration program. It consists of a crew module (CM), a space capsule built by Lockheed Martin, and is paired with a European Service Module (ESM) provided by the European Space Agency (ESA) and manufactured by Airbus Defence and Space. Orion supports a crew of four beyond low Earth orbit for up to 21 days undocked or up to six months when docked. It is equipped with a NASA Docking System port and glass cockpit displays. It is intended to be launched atop the Space Launch System (SLS) rocket with a tower-mounted launch escape system. Orion was conceived in the early 2000s by Lockheed Martin as a proposal for the Crew Exploration Vehicle (CEV) to be used in NASA's Constellation program and was selected by NASA in 2006. After the cancellation of the Constellation program in 2010, Orion was extensively redesigned for use in NASA's Journey to Mars initiative; later named Moon to Mars. The SLS became Orion's primary launch vehicle, and the service module was replaced with a design based on ESA's Automated Transfer Vehicle. As of 2026, three flight-worthy vehicles had been built along with several boilerplates and test articles. Three additional flight-worthy vehicles are under construction. In May 2025, the second Trump administration proposed terminating the Orion spacecraft program after Artemis III. The One Big Beautiful Bill Act signed in July 2025 included a provision to fund procurement of Orion for Artemis IV and reuse in future missions.