S. M. Stirling is the author of numerous science fiction and fantasy novels, including the popular Nantucket series that began with Island in the Sea of Time.
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In the parallel world first introduced in S. M. Stirling's The Sky People, aliens terraformed Mars (and Venus) 200 million years ago, seeding them with life-forms from Earth. Humans didn't suspect this until the twentieth century, but when the first probe... SEE MORE