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Down is the homeworld of the Grogs[1]. It orbits a K-type star, significantly redder and cooler than Sol.

Once belonged to the Kzin Patriarchy before it was liberated by the humans.[2] Humans have placed a Bussard Ramjet Field Generator in close orbit about Down's sun to destroy the Grog population, should they take threatening action against any sentient species. Ultraviolet lights are needed to grow any plants on Down due to the lack of good UV from its sun.[3]

References
  1. Database
  2. Database
  3. http://news.larryniven.net/concordance/