Eon by Greg Bear, and then its sequel, Eternity, which is about as good as the first book.|
Tau Zero by Poul Anderson... set in the future, but with a good physics grounding.
I'm not sure it counts as hard sci-fi, but given its roots in Chernobyl Roadside Picnic by the Strugatsky Bros might be a good choice (it's also pretty short).
#9165789, By GrandpaUlrira Recommend me a hard sci-fi
GrandpaUlrira 3,784 posts
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