Andymon

Andymon. Eine Weltraum-Utopie is a 1982 East German science fiction novel by Angela and Karlheinz Steinmüller.
It was republished in 2004, revised by authors and supplied with a detailed afterword titled " 'This sentence saved the book'. The long road to Andymon".
In 1999 the authors wrote a prequel short story, Das Auswandererschiff.

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Authors' summary:

It was ranked as the most popular East German science fiction novel in a 1989 poll.
In 2019, Germany’s SF portal Tor Online conducted a poll among 219 participants, after which a jury selected "The 100 Best Science Fiction Books of All Time". Andymon was one of them, one of the only six written by German authors.