Quite a few have mentioned Heinlein. Read almost all his books as a teenager, still grab one out every now and then. Best ones would be:
Orphans of the Sky
Methuselahs Children
Starship Troopers (enjoy the read and the adventure, not the message so much)
Time for the Stars
Tunnel in the Sky
Starman Jones
Farnhams Freehold (interesting but controversial read!!)
Citizen of the Galaxy
There are more but ones to avoid are:
Time Enough for love
Friday
Stranger in a Strange Land
Malcolm
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