Definitions By Contrast
Some critics distinguish between space opera and planetary romance. Where space opera grows out of both the Western and sea adventure traditions, the planetary romance grows out of the lost world or lost civilization tradition. Both feature adventures in exotic settings, but space opera emphasizes space travel, while planetary romances focus on alien worlds. In this view, the Martian, Venusian, and lunar-setting stories of Edgar Rice Burroughs would be planetary romances (and among the earliest), as would be Leigh Brackett's Burroughs-influenced Eric John Stark stories.
Space opera can also be contrasted with "hard science fiction", in which the emphasis is on the effects of technological progress and inventions, and where the settings are carefully worked out to obey the laws of physics, cosmology, mathematics, and biology.
One subset of space opera overlaps with military science fiction, concentrating on large-scale space battles with futuristic weapons. In such stories, the military tone and weapon system technology may be taken very seriously. At one extreme, the genre is used to speculate about future wars involving space travel, or the effects of such a war on humans; at the other it consists of the use of military fiction plots with some superficial science fiction trappings. The term "military space opera" is occasionally used to denote this subgenus, as used for example by critic Sylvia Kelso when describing Lois McMaster Bujold's Vorkosigan Saga.
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