Exploration Mission 1
|Spacecraft type||Orion MPCV|
|Start of mission|
|Launch date||November 2018|
|Rocket||SLS Block 1|
|Launch site||Kennedy LC-39B|
|End of mission|
|Landing site||Pacific Ocean|
|Flyby of the Moon|
|Closest approach||December 2018|
Exploration Mission 1 or EM-1 (previously known as Space Launch System 1 or SLS-1) is the first planned flight of the Space Launch System and the second uncrewed test flight of the Orion Multi-Purpose Crew Vehicle. As of December 2014[update], the launch is projected to occur September 30, 2018 from Launch Complex 39B at the Kennedy Space Center, and the Orion spacecraft would perform a circumlunar trajectory during the seven day mission. It is planned to be followed by Exploration Mission 2.
The Block 1 version of SLS used on this mission will consist of two five-segment Solid Rocket Boosters, four RS-25D engines built for the Space Shuttle program and an Interim Cryogenic Propulsion Stage. EM-1 is intended to demonstrate the integrated spacecraft systems prior to a crewed flight and demonstrate a high speed reentry (11 km/s) on Orion's thermal protection system.
On January 16, 2013, NASA announced that the European Space Agency would build Orion's service module based on its Automated Transfer Vehicle, so the flight could also be regarded as a test of ESA hardware as well as American, and of how the ESA components interact with the American Orion components.
The EFT-1 flight article was consciously constructed in a way that if all the missing components (seats, life support systems) were added, it would not meet the mass target. It was planned that subsequent capsules would be modified to be lighter, based on manufacturing experience.
In January 2015 NASA and Lockheed announced that some components in the EM-1 capsule would be up to 25 percent lighter compared to the previous one. This would be achieved by changes to the primary structure - the EM-1 article it would be welded together from three panels for the cone, as opposed to 6 panels used for the EFT-1 article. The total number of welds was reduced from 19 to 7, thus saving the additional mass of the weld material. Other savings would be due to revisiting its various components and wiring. For EM-1 the capsule will be outfitted with complete life support system and crew seats, just no crew.
Thirteen low-cost CubeSat missions were selected as secondary payloads on the EM-1 test flight. They will reside within the second stage on the launch vehicle from which they will be deployed. The spacecraft already selected are: 
- Lunar Flashlight is a spacecraft propelled by a solar sail that will determine the presence or absence of exposed water ice, and map its concentration at the 1-2 kilometer scale within the permanently shadowed regions of the lunar south pole.
- Near-Earth Asteroid Scout is proof-of-concept of a controllable CubeSat solar sail spacecraft capable of encountering near-Earth asteroids (NEA). Observations will be achieved through a close (≈10km) flyby and using a high resolution science-grade monochromatic camera to measure the physical properties of a near-Earth asteroid, helping inform the future Asteroid Redirect Mission. A variety of potential targets would be identified based upon launch date, time of flight, and rendezvous velocity.
- BioSentinel is an astrobiology mission that will use yeast to detect, measure, and compare the impact of deep space radiation on living organisms over long durations beyond low-Earth orbit.
- Lunar IceCube, designed by Morehead State University, will search for evidence of water ice in a low lunar orbit.
- CuSP (CubeSat for Solar Particles) will be one of the first CubeSats to enter interplanetary space. It is designed to study the dynamic particles and magnetic fields that stream from the Sun and as a proof of concept for the feasibility of a network of stations to track space weather.
- LunaH-Map will map hydrogen within craters near the lunar south pole.
NASA awarded two CubeSat contracts in March 2015 to Lockheed Martin ($1.4 million) and Morehead State University ($7.9 million) to develop SkyFire and Lunar IceCube, respectively, that could potentially be added to the EM-1 test flight. The remaining six of the eleven SLS launch slots will be filled through a competition pitting CubeSat teams based in the United States against each other in a series of ground tournaments called 'NASA's Cube Quest Challenge'. This competition will contribute to opening deep space exploration to non-government spacecraft.
Apollo 8 was launched on a similar flight path by the Saturn V launch vehicle in 1968. This was also a mission designed to flight test a Command Service Module beyond low Earth orbit, crewed by 3 astronauts. It made use of its Service Module engine three times, to enter and leave lunar orbit.
Apollo 13 also flew a similar circumlunar flight path, after sustaining damage in an explosion, which prevented use of the Service Module engine and threatened the crew's survival. The spacecraft passed the Moon on a free return trajectory, and as a result holds the current absolute altitude record for a manned spacecraft. The mission's commander, James Lovell, holds the distinction of having set this record twice, the first time on Apollo 8.
- Exploration Mission 1: SLS and Orion mission to the Moon outlined, Chris Bergin, 29 February 2012
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- Steitz, David E. (24 November 2014). "NASA Opens Cube Quest Challenge for Largest-Ever Prize of $5 Million". NASA News. Retrieved 2015-05-27.