Remember that the atmosphere was here before we were. So instead of being crushed by the weight of the atmosphere, we have developed to “push back” by the same amount. Remove the atmosphere so there’s nothing to balance our “push out” against, and we go pop.
A balloon, inflated on Earth, will pop in space. Next time you’re near a 20+ floor building, take a balloon. Inflate it a ground level and take a photo (next to your head for size comparison). Take the elevator to the top floor and take another photo. The balloon is bigger because there is less atmosphere holding it in. Back at ground level, the balloon is back to “normal” size.
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