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As with "terrestrial", everything on Earth is arguably Terran, that is it is just as legitimate to say "of terran origin" as "of terrestrial origin".
Some, such as Hugo De Garis, make the distinction that those who want to leave Earth or destroy it may be of terrestrial origin but are not in fact Terran. He defines a Terran in political opposition to a Cosmist—the latter being those who wish to build artificial intelligence beyond human capabilities and leave Earth.
That distinction seems to be derived from earlier usage of terran by many science fiction authors as a synonym for earthling or human or terrestrial—most notably in the context of alien encounters with humans. It is particularly useful in contexts—such as most popular science fiction television shows—where there are humans or near-humans from other planets, necessitating a term for inhabitants Earth that is more specific than human. This usage is probably related to the term Martians for natives of Mars
Sometimes Terran and earthling are used for joke impact, when aliens cannot tell humans from other highly active-and-possibly cognitive terran entities, for example dogs, great apes, whales, and occasionally automobileAn automobile usually called a car (an old word for carriage) or a truck is a wheeled vehicle that carries its own engine. Older terms include horseless carriage and motor car with "motor" referring to what is now usually called the engine. The act of opes. For example, in Star Trek IV - The Voyage Home , an alien ship seeking whales to talk to is causing tremendous harm to Earth, as whales are long extinct and its increases in volume go unheard; on previous visits, the aliens apparently recognized whales, and not humans, as the species worth engaging in conversation. A similar theme was expressed in Visit to a Small Planet , when aliens who visited Earth were convinced it was ruled by cars, with human parasites in them.
The term Terran has specific applications in some science fiction stories. For example:
In modern science fiction, Terran is more common than earthling, since the latter term carries a diminutive connotation. Occasionaly a completely different term will be introduced: for example, in the Stargate universe, humans from Earth are the Tauri (a term which does contain some of the same sounds as Terran).