Space Opera Sci-Fi is a huge descriptive category and also labeled as Adventure Sci-Fi. The subgenre features swashbuckling action, set in a vast panorama. Films in this sub-genre are also often labeled as Fantasy Sci-Fi. Space opera often involves good guys shooting it up with bad guys in the depths of space or on a distant planet. There is little or no attention given to scientific plausibilities and technical explanations tend to be vague.
Many space operas diverge even more from known physical reality, and commonly invoke paranormal forces, or vast powers capable of destroying whole planets, stars, or galaxies. Stories emphasize over-sized, often somewhat tongue-in-cheek adventures in space featuring swashbuckling heroes, beautiful women, and exotic aliens.