There were many novels similar to Starship Troopers, such as Star Trek, The Hitchhiker's Guide to the Galaxy, Star Wars, and so on. These novels all involved interstellar adventures, sci-fi wars, alien creatures, future technology, and other topics. If you're interested in these novels, I can recommend some to you, such as Star Pirates from the Star Trek series, Blade Runner from the Hitchhiker's Guide to the Galaxy, and so on.