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Related Clues:
- To us, they're worlds apart
- Ufologist's concern
- Klingons and Vulcans
- Sci-fi invaders
- Sequel set on the moon LV-426
- Saucer fliers
- Visitors from afar
- They can be resident or non-resident
- Sigourney sequel
- Foreigners
- Seven-Oscar nominee in the '80s
- Science fiction staples
- Astronauts
- Saucer people
- Bradbury beings