The unarguably the best place like Mars environment on Earth, the north side of Mauna Loa to six NASA crew members for one year.
The place is dome-shaped structure; they were living out the newest developed in a series of NASA-operated missions to inform spaceflight the “Operation HI-SEAS,” for Hawaii Space Exploration Analog and Simulation.
Their mission was designed to study the psychological impact of long-term space travel by maintaining the crew in confined environments with same people.
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Source and image by wired