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Most of the stars come because this is the seminal work on settling Mars. 50% of the book is about the characters' weird sex lives - including some hints to child SA. The other 50% is involving the science of settling Mars (which is what I wanted to read), but nearly all of it has since the time of writing been proven impossible due to the results returned from the Mars' Rovers. It took me a really long time therefore to suspend my disbelief.