| Definition | being of Earth style or manufacture |
| OED requirements | antedating 1941 |
| Earliest cite | Jack Williamson, 'Son of Two Worlds' |
| Comment | Katrina Campbell submitted a 1981 cite from Bob Shaw's "Galactic Tours". Katrina Campbell submitted a cite from a 1985 reprint of Edmond Hamilton's 1968 "The Closed Worlds". Katrina Campbell submitted a cite from a 1980 reprint of Edmund Cooper's 1969 "Sea-Horse in the Sky". Ralf Brown located a cite from Robert Silverberg's "Collecting Team"; Mike Christie submitted the cite from a 1971 reprint. Ralf Brown submitted a 1953 cite from Hal Clement's "Mission of Gravity". Malcolm Farmer submitted a cite from a reprint of Poul Anderson's "Star Ship"; Mike Christie verified the cite in the 1950 original magazine appearance. Douglas Winston submitted a cite from a 2000 reprint of Leo Frankowski's 1999 "A Boy and His Tank". Fred Galvin submitted a cite from a 1959 reprint of Edmond Hamilton's "Son of Two Worlds", which MIke Christie verified in its 1941 first publication. |
| Last modified | 6 July, 2008 |
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| 1944 ‘H. Clement’ Trojan Fall in Astounding Sci. Fiction June 58/2 | He was reasonably certain of finding a habitable planet; the star that lacked worlds was the exception rather than the rule. Earth-type worlds were rarer, but frequent enough to have forced the enactment of several regulations against unrestricted colonization. |
| 1956 C. D. Simak in Galaxy Oct. 106/1 | It's Earth-type, oxygen, and the climate's fine so far. |
| 1988 K. Randle & R. Cornett Aldebaran Campaign 56 | If the planet hadn't had an Earth-type atmosphere, we'd have had to go in wearing environment suits and set up our own biosphere shelter so we could occasionally stand-down without the suits. Living in an environment suit is a bitch. |
| 1994 Interzone July 9/1 | The search was soon switched to Earthtype planets, and these proved difficult to find. |