Design
The Constellation Space Suit system was designed by NASA for Project Constellation due to the needs of reducing space on board the relatively small (by current standards) Orion crew vehicle, and at the same time, protect the astronauts during launch, reentry and landing, and extreme emergencies (such as a cabin depressurization). Another need for NASA was that the suit system must be capable of withstanding the rigors of microgravity EVAs, and with modifications, from the rigors of lunar surface EVAs during a 7-day lunar sortie, with the provisions for 6-month stays once the Lunar Outpost is completed.
As the Apollo/Skylab A7L, ACES, and Shuttle/ISS Extravehicular Mobility Unit (EMU) pressure and space suits were deemed unsuitable for NASA's needs for Project Constellation, a new suit system was designed and is designated as "Configuration One" (IVA/Microgravity EVA) and "Configuration Two" (Lunar EVA).
Read more about this topic: Constellation Space Suit
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