Fighter pilots need G-suits when they make high-G turns, otherwise their blood shifts towards their lower body and they black out. That's proof that the stuff inside your body can move independantly. Your body is strapped into the seat, so it's forced to move with the plane, but the blood wants to stay where it was due to inertia. And that's going to happen regardless of whether there's a vacuum or not. G-force is g-force, it doesn't matter if it's just normal Earth gravity or a 7G turn in a fighter jet. I don't get why you guys are talking about air resistance, when it's gravity and intertia that causes the effects I'm describing.
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