Space opera is adventure science fiction set mainly or entirely in outer space or on sometimes distant planets. The conflict is heroic, and typically on a large scale. It is also used nostalgically, and modern space opera may be an attempt to recapture the sense of wonder of the golden age of science fiction. The pioneer of this subgenre is generally recognized to be Edward E. (Doc) Smith, with his Skylark and Lensman series. George Lucas's Star Wars series is among the most popular and famous franchises in cinematic space opera. It covers epic battles between good and evil throughout an entire galaxy. Alastair Reynolds's Revelation Space series, Peter F. Hamilton's Void, Night's Dawn, Pandora's Star series, Stephen Hunt's Sliding Void series, Vernor Vinge's A Fire Upon the Deep, A Deepness in the Sky are newer examples of this genre.