I have not done a sci-fi movie poll. I've done best sci-fi TV series but this list is merely the top Space Movies:

1. Apollo 13
2. 2001: A Space Odyssey
3. Star Wars (for the whole trilogy)
4. Alien (for the entire series)
5. Forbidden Planet

I believe I decided that I didn't want to wade into definitions of sci-fi and run through a hundred movie poll.

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Keeper of the Jabberwock