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I'd suggest Robert J. Sawyer, he is one of my favorite authors. It depends on what sort of book you are looking for, he writes both hard scifi and scifi/mystery crossovers.
For a stand-alone, I would perhaps start with Factoring Humanity or Starplex (if you are looking for space Opera). He has also written three trilogies, The Neanderthal Parallax about a parallel earth where Neanderthals survived and Homo sapiens got extinct, and his more recent WWW trilogy about the world wide web developing conscience.
Other people have already mentioned Stephen Baxter, whom I enjoy, too. He has written a great sequel to H. G. Wells's The Time Machine: The Time Ships.
I also like about anything by Jack McDevitt.
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