Orion is a spacecraft design currently under development by the United States space agency NASA. Each Orion spacecraft will carry a crew of four to six astronauts. The spacecraft is designed to be launched by the Ares I, a launch vehicle, also currently under development. Both Orion and Ares I are elements of NASA's Project Constellation, which plans to send human explorers back to the Moon by 2020, and then onward to Mars and other destinations in the Solar System. On August 31, 2006, NASA awarded Lockheed Martin (LM) the contract to design, develop, and build Orion.

    Orion will launch from Launch Complex 39 at Kennedy Space Center, the same launch complex that currently launches the space shuttle. While shuttle operations continue from launch pad 39A, 39B is being readied for Ares launches. NASA will use Orion spacecraft for its human spaceflight missions after the last shuttle orbiter is retired in 2010. The first crewed Orion flight is anticipated in 2015.Subsequent flights will visit the International Space Station. If commercial orbital transportation services are unavailable, Orion will handle logistic flights to the Station.After that, Orion is to become a key component of human missions to the Moon and Mars.

America will send a new generation of explorers to the moon aboard NASA’s Orion crew exploration vehicle. Making its first flights to the International Space Station early in the next decade, Orion is part of the Constellation Program to send human explorers back to the moon, and then onward to Mars and other destinations in the solar system.