TRADE with them is sporadic, and even WARFARE seems less frequent than it used to be in the GOLDEN AGE.
This is partly because it is not clear what we would fight them over, and partly because they may have an alarmingly high TECHLEVEL, making war with them a dangerously one-sided proposition. See COSMIC BACKGROUND HISTORY.2) Aliens with Forehead Ridges.
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Still less common than that term, but has been used by multiple writers..
Nor is it used for Earth Humans who must register with the immigration service.
Exosemanticists have their work cut out understanding them, and exopsychologists in figuring out what they're all about.Not only do Aliens with Forehead Ridges mostly look like Earth Humans, they tend to act like Earth Humans as well, or at least one particular (real or speculative) Earth Human culture.A particular race of Aliens with Forehead Ridges may all have a culture like that of medieval Japan, or one based entirely on music, but you will very rarely find more than one culture per species.Suggested reading includes The Encyclopedia of Science Fiction's entry on "Aliens", Steve Colgan's Worlds of Possibility blog, Life Everywhere by David Darling, The Science of Aliens by Clifford Pickover and Aliens and Alien Societies by Stanley Schmidt.[first use unknown, but goes back at least to 1940s]General SF term for an extraterrestrial or alien possessing human-level intelligence (see sophont).Etymologically, and in mainstream English the word means "feeling" but is rare and now archaic.[From Poul Anderson's `Polesotechnic League' stories, going back at least to 1963]An evolved biological intelligence.