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user-inactivated  ·  3007 days ago  ·  link  ·    ·  parent  ·  post: Cassini's Grand Finale

In Niven's Man-Kzin wars series that was a part of the background of the universe he created. An ancient progenitor race seeded planets all over the galaxy with biological material to prep them for colonization. The ancient race went extinct leaving the seeded worlds behind.