Timeline for How would an advanced civilization on a space station not be able to explore the planet they orbit without significant time between each expedition?
Current License: CC BY-SA 4.0
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| when toggle format | what | by | license | comment | |
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| Jun 16, 2020 at 11:03 | history | edited | CommunityBot |
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| Dec 15, 2018 at 16:16 | history | edited | Willk | CC BY-SA 4.0 |
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| Dec 15, 2018 at 1:58 | history | answered | Willk | CC BY-SA 4.0 |