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Q&A How big could an alien-made object on the far side of the moon become so that discovery still can only happen by accident?

A great way to introduce advanced technology to a story is to have it be of extraterrestrial origin. E.g. have a spaceship crash on earth, or, like I was planning to, put a derelict spaceport on th...

6 answers  ·  posted 7y ago by dot_Sp0T‭  ·  last activity 6y ago by dot_Sp0T‭

Question space moons space-constructs