Lem is famous for having being inducted into the American association of Sci-Fi writers (even if he was part of the Eastern Block) but then causing a furor when he wrote that most American sci-fi, with a few exceptions, was utter crap

Lem is great because he wrote very different novels. From critics of unwritten books to meeting with aliens, through questions about the beginning of the universe, robot stories and funny robot stories...
Also, Robert E. Forward, with Dragon's Egg for instance, whose novels have strong scientific grounds.
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