When it comes to space helmets, there's one rule: you keep your helmet on. But there might be a couple of places in the Solar System where you can take your helmet off, just for a few moments, and not die instantly.
Mechadense's YouTube comment: https://www.youtube.com/watch?v=G4g591h49HE&lc=z12kfhxxqpjuwber504cjruikl2bxduxeok0k
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