Space opera is a subgenre of science fiction that emphasizes science fictional space warfare, with use of melodramatic, risk-taking space adventures and chivalric romance.

What defines space opera?

: a futuristic melodramatic fantasy involving space travelers and extraterrestrial beings.

What's the difference between sci fi and space opera?

Science fiction, abbreaviated SF or sci-fi, is a form of fiction that deals principally with the impact of actual or imagined science upon society or individuals. Space opera is a different, more-romantic narrative genre within sci-fi. ...