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The debut novel of Andy Weir - The Martian - is supposed to be very good hard sci-fi as well. It's the next book on my reading pile, looking forward to reading it. It's about an astronaut who gets left behind on Mars and his attempts to survive and get home. The research and depth of the novel are reportedly very good, with a strong basis in science.
Just spotted on wiki that it will have a big budget movie adaptation released later this year :o .