We've got the tech already. There was an article in one of Jerry Pournelle's books that dealt with a potential satellite based weapons system (circa late '70's) called THOR, that was nothing more than 'smart' crowbars. Stick a guidance system and steering fins on a piece of metal, drop it from orbit, it acquires a target and BOOM. Kinetic energy weapons.
Like, far out man...
(and, after all, kinetic energy weapons would be environment-friendly, more or less...)
I like Jerry Pournelle's work. The books he co-wrote with Larry Niven are among my favorites. Though I must admit that 'The First Men in the Moon' by H.G.Wells with the spacecraft that was a sphere with a coating of Cavorite on panels that defied gravity still has fast to my imagination. Wells was an author who understood bigger things had to be defeated besides simple cause and effect that is a rocket moving in a controlled fashion skyward with more raw thrust then there is weight as a mass rises out of gravities greatest influence.
I really love books like Heinlein's 'Rocket ship Galileo' as the development of character to the spaceship is as elegant as some writing about naval vessels, but stories that creatively end run the absolutes like the theory of relativity, or quantum mechanics are usually my preference to read.