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SpaceX EVA Spacesuit Tested By Polaris Dawn Crew

The SpaceX EVA model spacesuit was tested at NASA’s Johnson Space Center in Houston, Texas at the end of June (see my earlier article SpaceX Intros Extravehicular Activity Suit for more details).

Polaris Dawn’s spacewalk will mark both the first-ever commercial spacewalk and the first time that four astronauts will be concurrently exposed to the vacuum of space. During the approximately two-hour-long operation, Mission Commander Jared Isaacman and Mission Specialist Sarah Gillis will separately exit the Dragon spacecraft through its forward hatch. Mission Pilot Kidd Poteet and Mission Specialist & Medical Officer Anna Menon will remain seated, managing spacesuit umbilicals and monitoring telemetry on Dragon’s interior displays.

This final spacesuit testing milestone took place at NASA’s Johnson Space Center in Houston, Texas, June 24-28, utilizing a historic chamber facility previously used to support testing of America’s earliest spacesuits and spacecraft during the Gemini and Apollo programs. Built in the mid-1960s, the facility was added to the National Register of Historic Places in 1985 and remains in use today to support various space industry tests.

Science fiction authors have a long history of introducing readers to the idea of space suits, the phrase having first been used in The Emperor of the Stars, by Nat Schachner (w. AL Zagat), published by Wonder Stories in 1931.

The idea that spacesuits should be tested in vacuum has an even longer history. In his 1929 story The Shot Into Infinity, scientifiction writer Otto Willi Gail describes the testing of a newly designed space suit:

Suchinow silently slipped into the costume and allowed Korf to screw on the helmet with the oxygen chambers. Then he placed himself in the center of the chamber. In one of his leather-covered hands Korf placed a burning candle. Then he closed the door, through the glass window of which all the proceedings could be witnessed. They could clearly hear an electric bell in the chamber, which Korf switched on.

The pump began to work. The candle flickered and went out. The bell seemed to sound fainter and fainter, though the clapper kept on striking. korf shut off the pump.

"Now, except for weight and heat, the same conditions prevail in this chamber as in space. Yet Mr. Suchinow, with whom we cannot communicate at present, certainly feels alright."

Sam looked through the window, and laughed out loud. In fact Suchinow presented a very comical appearance. The suit had swelled to its fullest extent and had taken on the shape much like that of the favorite rubber dolls of festival times.

Probably the earliest description of an Extra-Vehicular Activity can be found in Edison's Conquest of Mars by Garret P. Serviss, published by the New York Evening Journal in 1898. See the entry for electrical 'tether'.

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