Since 2012, numerous iterations of large lunar and Mars transport habitats have been conceived in previous studies to be launched with the Space Launch System (SLS),[2][3] and are intended to also be compatible with the Orion capsule.
Variations of the designs would be used for the Lunar Gateway and the Deep Space Transport.
[2] Early preliminary concepts considered 60-day and 500-day mission configurations, composed of International Space Station-derived hardware, the Orion crew capsule and various support craft.
[5] Lockheed Martin, the main contractor of the Orion capsule, also produced in 2018 a Deep Space Habitat concept.
[6] These concept studies were intended to help NASA decide on a final design for the habitat element for the Lunar Gateway.