They had sent numerous unmanned probes into space, animal missions with bio-metric sensors on the animals, and 1000s of very high altitude flights to collect data.
They had a great idea of the space environment and how to build a suitable suit. It was the micro gravity that was more of an unknown.
Short time periods in space isn’t actually that taxing from a materials/engineering perspective. Getting there, getting back, or staying for a long time is the motherfucker.
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