The Exploration Systems Mission Directorate (ESMD) Constellation Program is responsible for developing the Crew Exploration Vehicle (CEV), Crew Launch Vehicle (CLV), Cargo Launch Vehicle (CaLV), and related exploration architecture systems that will provide humans the capabilities necessary to travel and explore the solar system. The CEV is the spacecraft that NASA plans to use to send human and cargo items into space and to return them to Earth. The CLV, an in-line configuration with a 5-segment Reusable Solid Rocket Motor (RSRM) as the First Stage, and a new Upper Stage powered by a liquid hydrogen / liquid oxygen J2X engine, will deliver the Crew Exploration Vehicle (CEV) to low-Earth orbit early next decade.
From its initial position in low-Earth orbit, the CEV has the capacity to either continue on to the International Space Station, or to dock with an Earth Departure Stage (EDS), launched separately on NASA's heavy-lift Cargo Launch Vehicle (CaLV). The EDS will provide the navigation and propulsion necessary to execute a lunar mission. While each of these elements will play a major role executing the Nation's space exploration activities, the information provided via this website will focus solely on the design and development of the CLV Upper Stage.
NASA plans to use this website as a communications platform to provide general design and development information as it becomes available to the potential CLV partners. All information contained herein represents the current program content, and is provided for planning purposes only. Any Requests for Proposals (RFP) that are issued will contain the specific requirement documents for proposal development.
This information does not replace the NASA Acquisition Information System (NAIS); all official acquisitions and acquisition-related documents will be published on NAIS.Available Precursor Documents