Space Opera is a sub-genre of space fantasy SF. Space Opera uses the trappings and props of SF but doesn't follow science fiction SF's adherence to hard science and the scientific perspective; instead, these trappings and props provide the backdrop for powerful emotions and high adventure on a cosmic stage. Examples of Space Opera include the Star Wars saga, the Classic Star Trek and Babylon 5 television series, and E. E. "Doc" Smith's The Lensman novels.