If you’ve ever seen the movie ‘Gravity,’ you have an idea of how existentially terrifying the mere notion of an emergency in space is. It’s not like an emergency aboard a plane, where the forces of gravity and a parachute can still guide you safely back down to solid ground. If there were a true life-or-death emergency in the dark depths of space, there wouldn’t be anywhere truly safe for you to go. Of course, the brave men and
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