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Sep 29, 2021 at 21:33 comment added NKCampbell reminds of Star Trek original series episode: "For the World is Hollow and I Have Touched the Sky"
Sep 29, 2021 at 21:31 vote accept user73910
Sep 29, 2021 at 21:31 answer added user73910 timeline score: 6
Sep 28, 2021 at 6:00 history tweeted twitter.com/StackSciFi/status/1442730802266116110
Sep 27, 2021 at 22:13 comment added David Tonhofer @Separatrix It was neither mainstream nor a common trope. That Earth is a sphere was however known since at least Alexander the Great.
Sep 27, 2021 at 6:01 comment added Separatrix Hollow Earth was fairly mainstream thinking before it was found not to be true, so a common trope in early sci-fi.
Sep 27, 2021 at 4:10 comment added FuzzyBoots When did you watch these? Did they seem older than that?
Sep 27, 2021 at 3:38 history asked user73910 CC BY-SA 4.0