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 | |
|---|---|---|---|---|---|
| Dec 14, 2018 at 13:53 | history | answered | Julian Egner | CC BY-SA 4.0 |