Artemis 1 is a planned uncrewed test flight for NASA's Artemis program that is the first integrated flight of the agency's Orion MPCV and Space Launch System super heavy-lift rocket. It is expected to launch on 22 November 2021. Formerly known as Exploration Mission-1, the mission was renamed after the introduction of the Artemis program. The launch will be held at Launch Complex 39B at the Kennedy Space Center, where an Orion spacecraft will be sent on a mission of 25.5 days, 6 of those days in a retrograde orbit around the Moon. The mission will certify the Orion spacecraft and Space Launch System launch vehicle for crewed flights beginning with the second flight test of the Orion and Space Launch System, Artemis 2, which will carry a crew of four around the Moon in 2023 for a week-long mission and back prior to the assembly of the Gateway. The Lunar Gateway can further be extended for several lunar missions at a time.