primer contacto

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First contact is a common theme in science fiction about the first meeting between humans and extraterrestrial life, or of any sapient species' first encounter with another one, given they are from different planets or natural satellites. It is closely related to the anthropological idea of first contact. Popularized by the 1897 book The War of the Worlds by H. G. Wells, the concept was commonly used throughout the 1950s and 60s, often as an allegory for Soviet infiltration and invasion. The 1960s American television series Star Trek introduced the concept of the "Prime Directive", a regulation intended to limit the negative consequences of first contact. Although there are a variety of circumstances under which first contact can occur, including indirect detection of alien technology, it is often portrayed as the discovery of the physical presence of an extraterrestrial intelligence. As a plot device, first contact is frequently used to explore a variety of themes.