Dirna is the name of the gas giant Procyon IX that is home to the four armed, green skinned Dirnan, the hydrogen and ammonia breathing extraterrestrials in Robert Silverberg’s 1957 novel Master of Life and Death. Although the neighboring Procyin VIII or New Earth is ideal for human colonization via a newly developed faster than light drive, settlement is vetoed by the Dirna. Unlike humans, the Dirnan succeeded in stabilizing their population thousands of years in the past.


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