1).The original Dune (the others tend to be repetitive)
2).The works of Arthur C. Clarke (2001, Rendezvous With Rama, plus numerous short stories)
3). The works of Orson Scott Card (my personal favorite, Pastwatch the Redemption of Christopher Columbus)
4). Vernor Vinge's A fire Upon The Deep, & A Deepness In The Sky
5). The works of Michael Crichton (not quite sure one would classify them as scifi, except maybe The Andromeda Strain and possibly Jurassic Park)
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