Summary: 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.
Summary: 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.