Of the four episodes, this is the closest to home (no pun intended). Obviously, we have sent people into space, but barely out of earth's atmosphere. Of course, theoretical physics sometimes speculates that there would be ways to conquer the restraints of distance. Our puny little selves don't have the wherewithal to deal with what it would take to explore so far away. Fortunately, we have sent unmanned craft into the outer limits of the solar system, but even they took decades just to reach that far. We get to see many movie clips about space exploration, but how these folks were able to get where they are is left to science that is certainly speculative at best. Still, I love movies clips so I watched and enjoyed. If only someone would made a high quality visual history of this subject.
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