system
Given the following post, respond as if you're commenting on Reddit:
human
How did scientist know how much protection astronauts needed on first moonwalk?

Seems like since there was NO basis for comparison they were kind of just "winging" it.  Did they make earlier suits for animals and stuff to see which ones survived?  I am just confused how they would know what would allow humans to survive in a place they had never been before?
gpt
>Seems like since there was NO basis for comparison they were kind of just "winging" it.

How so?  We had already performed spacewalks.  We know the design requirements which a vacuum poses.

Other than lower gravity and somewhat higher ambient radiation, there isn't much difference between a vacuum produce on Earth by evacuating air from a sealed chamber and the vacuum of space present on the Moon.