[This is a review of the novel The Ophiuchi Hotline by John Varley, first published in 1977. John Varley is my favorite science fiction author. This is my first review of his first novel. I haven't done a lot of book reviews, so be kind.]It's six hundred years in the future, and the human race has been permanently exiled from Earth by alien Invaders that prefer cetaceans to humans. The remnants of humanity live on the moon as well as pretty much any airless rock and inhospitable planet in the solar system that can hold them.