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Reference.org
Human analog mission
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<p>Human analog missions are activities undertaken on Earth in various environments to simulate aspects of human missions to other worlds, including the <a href="/facts/Moon/zKHqEMPb">Moon</a>, <a href="/facts/Asteroids/g7Ulr1VB">asteroids</a>, and <a href="/facts/Mars/AQGtVvz0">Mars</a>. These remote field tests are performed in locations that are identified based on their physical similarities to the extreme space environments of a target mission. Such activities are undertaken to test hardware and operational concepts in relevant environments. </p><p>Obviously no analog can simulate all aspects of a human space mission here on Earth. That is why a wide array of analog activities are necessary, each testing only a few important concepts and/or hardware elements at a time. </p>