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Why would a previously spacefaring civilization become unable to build another interstellar ship?

space space-travel space-colonization asked Jan 3 at 11:29

worldbuilding.stackexchange.com

How can I help my friend who is depressed and isolated?

friends depression asked Jan 9 at 9:04

interpersonal.stackexchange.com

Top Answers

Realistically, how does Captain Marvel know to rescue them?

movies.stackexchange.com