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==Description and history==
The Twenty-Five-Foot Space Simulator is a stainless-steel cylinder {{convert|85|ft|m}} in height and {{convert|27|ft|m}} in diameter. A doorway {{convert|15|ft|m}} wide and {{convert|25|ft|m}} high provides access for bringing test objects and equipment into the chamber; a personnel access door is built into the larger doorway. The walls and floor of the chamber are lined with cooling shrouds providing a controllable temperature range from {{convert|-320|F|C}} to {{convert|200|F|C}}. A series of lamps, lenses, and mirrors are capable of irradiating the chamber with a directed beam of simulated solar energy in a variety of patterns and strengths. The chamber is capable of being depressurized to
Operation of the chamber requires about 75 minutes to achieve a space-like environment, and about 2-1/2 hours to return to a normal environment. The chamber is fitted with a number of attachment points and methods by which test objects can be mounted. The floor of the chamber is mounted on a seismically isolated foundation.<ref name="nrhpinv2"/>
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