In on particular order:
Terry Pratchett - Discworld series
Isaac Asimov - misc. robot stories
Robert Heinlein
Arthur C. Clarke - 2001, Childhoods End, Randevous with Rama
Ursala K. Le guin - Dispossessed, The Lathe of Heaven, Earthsea Trilogy
Lous McMaster Bujold - Vor series
David Drake - Honor Harrington series
Granted, much of that is to literature as popcorn is to fine dining, but still fun to read.
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