Imagery
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Film theorist Vivian Sobchack argues that science fiction films differ from fantasy films in that while science fiction film seeks to achieve our belief in the images we are viewing, fantasy film instead attempts to suspend our disbelief. The science fiction film displays the unfamiliar and alien in the context of the familiar, thereby making the images appear ordinary.
Despite the alien nature of the scenes and science fictional elements of the setting, the imagery of the film is related back to mankind and how we relate to our surroundings. While the sf film strives to push the boundaries of the human experience, they remain bound to the conditions and understanding of the audience and thereby contain prosaic aspects, rather than being completely alien or abstract.
Genre films such as westerns or war movies are bound to a particular area or time period. This is not true of the science fiction film. However there are several common visual elements that are evocative of the genre. These include the spacecraft or space station, alien worlds or creatures, robots, and futuristic gadgets. More subtle visual clues can appear with changes the human form through modifications in appearance, size, or behavior, or by means a known environment turned eerily alien, such as an empty city.
Scientific elements
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While science is a major element of this genre, many movie studios take significant liberties with what is considered conventional scientific knowledge. Such liberties can be most readily observed in films that show spacecraft maneuvering in outer space. The vacuum should preclude the transmission of sound or maneuvers employing wings, yet the sound track is filled with inappropriate flying noises and changes in flight path resembling an aircraft banking. The film makers assume that the audience will be unfamiliar with the specifics of space travel, and focus is instead placed on providing acoustical atmosphere and the more familiar maneuvers of the aircraft.
Similar instances of ignoring science in favor of art can be seen when movies present environmental effects. Entire planets are destroyed in titanic explosions requiring mere seconds, whereas an actual event of this nature would likely take many hours. A star rises over the horizon of a comet or a Mercury-like world and the temperature suddenly soars many hundreds of degrees, causing the entire surface to turn into a furnace. In reality the energy is initially reaching the ground at a very oblique angle, and the temperature is likely to rise more gradually.
The role of the scientist has varied considerably in the science fiction film genre, depending on the public perception of science and advanced technology. Starting with Dr. Frankenstein, the mad scientist became a stock character who posed a dire threat to society and perhaps even civilization. Certain portrayals of the "mad scientist", such as Peter Sellers's performance in Dr. Strangelove, have become iconic to the genre. In the monster movies of the 1950s, the scientist often played a heroic role as the only person who could provide a technological fix for some impending doom. Reflecting the distrust of government that began in the 1960s in the U.S., the brilliant but rebellious scientist became a common theme, often serving a Cassandra-like role during an impending disaster.