Guest
asked 2 years ago
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They want to be alive when they again make contact with Terra Firma!
Without sufficient percentage of oxygen being available in the breathing atmosphere that they would be operating in, 21.8 ppm is normal at the surface of earth, their brain would close down to 'entrap' oxygen in the brain's arteries, otherwise they go unconscious, followed by a crash landing on return to the earth's surface!
Without sufficient percentage of oxygen being available in the breathing atmosphere that they would be operating in, 21.8 ppm is normal at the surface of earth, their brain would close down to 'entrap' oxygen in the brain's arteries, otherwise they go unconscious, followed by a crash landing on return to the earth's surface!
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At high altitude there is less oxygen so they wear oxygen masks while flying at very high altitude.
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Guest
answered 2 months ago
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