The Two Moons by James P. Hogan
First published in 2006; published digitally by Baen Books on December 3, 2013.
The Two Moons reprints two novels by James P. Hogan. Inherit the Stars, a fine if flawed science fiction novel, was first published in 1978. Its less interesting sequel, The Gentle Giants of Ganymede, was published in 1981. Both novels are reviewed on Tzer Island; follow the links if you're interested.
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