Last summer Slate had a nice piece about the “Afronaut Invasion.” I.e. hip-hop music that was obsessed with outer space and sci-fi stuff.
I gotta say, that the more electro and spacey crazy aspects of hip-hop are certainly my favorites. The first hip-hop album I really loved was Missy Elliott’s Miss E… So Addictive (which I also think is her “gay” album).