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Earthlings (also known as Earthers or Gaians, or Terrans) are inhabitants of planet Earth. ... The word is first attested in this sense in the 1590s, and was used in science fiction as early as 1949, in Red Planet by Robert A. Heinlein
A Martian is an inhabitant of the planet Mars or a human colonist on Mars. Although the search for evidence of life on Mars continues, many science fiction writers have imagined what extraterrestrial life on Mars might be like.