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My kid is 9, but he reads a grade level or two above his grade.. he's shown a big interest in science fiction but I'm really having problems trying to find anything that would be at (or even above) his level that isn't fantasy, or a comic, or that wouldn't have inappropriate content.

All my favorites have deep and complex themes that would probably be lost on or at the very least be uninteresting to him. Almost need bad quality scifi that's more just fancy space battles and stuff.

Any suggestions?

Ender's Game was the first that came to mind but even that I'm not sure would be appropriate.

Maybe the Star Wars novels?