Earth-type adj. 2

resembling the planet Earth; having characteristics (as atmosphere, temperature, or gravity) that are similar enough to Earth to support human life

Usu. in phrase Earth-type planet.

  • 1941 R. A. Heinlein Methuselah's Children in Astounding Science-Fiction Aug. 98/1 page image Robert A. Heinlein bibliography

    To discover what sort and in particular whether it supported an Earth-type planet required a close approach at reasonably low speed.

  • 1944 ‘H. Clement’ Trojan Fall in Astounding Science Fiction June 58/2 Hal Clement

    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.

  • 1953 Astounding Science Fiction Apr. 39/2

    A faint swirl of white crystals followed him out—ice and carbon dioxide, frozen out of the Earth-type air inside as it cooled to Mesklin’s bitter temperature.

  • 1954 J. F. McComas Shock Treatment in R. Healy Nine Tales of Space & Time (1955) 53 J. Francis McComas

    That plant is now grown under government supervision on all Earth-type planets.

  • 1956 C. D. Simak in Galaxy Oct. 106/1 Clifford D. Simak

    It’s Earth-type, oxygen, and the climate’s fine so far.

  • 1957 P. Anderson & G. R. Dickson Earthman’s Burden 8 Poul Anderson Gordon R. Dickson

    We thought we’d look in and check on conditions, as well as resting ourselves on an Earth-type world.

  • 1966 ‘M. Leinster’ in Analog Science Fiction/Science Fact Nov. 28/1 Murray Leinster

    ‘There’s a yellow sun that looks close.’‘It’s Delhi… It has an Earth-type planet and there may have been a colony on it once. But there’s nothing there now! There’s something wrong with it and no ship is known to have got back to its home spaceport after landing on it.’

  • 1967 P. Meadows in Magazine of Fantasy & Science Fiction Apr. 89/1

    In this outer rim of the galaxy with its sparse star population, the explorer team was overjoyed to find an earth-type planet.

  • 1980 M. Edwards & R. Holdstock Tour of Universe 46

    Altuxor iv—otherwise known as Vandezande’s World or Kameleos—is Earth-type, though breathing apparatus is required.

  • 1988 K. Randle & R. Cornett Aldebaran Campaign 56 Kevin D. Randle Robert Cornett bibliography

    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.


Research requirements

antedating 1941

Earliest cite

Robert A. Heinlein, Methuselah's Children

Research History
Mike Christie submitted a cite from 1956. Enoch Forrester submitted a cite from a 1983 reprint of Andre Norton's "The Stars Are Ours!"; Mike Christie verified it in a 1955 reprint. We would like to check the 1954 first edition.
Cory Panshin submitted a cite from a 1957 reprint of Poul Anderson and Gordon Dickson's "Earthman's Burden"; we would like to check the 1951 original appearance of the story, "Heroes Are Made", in Other Worlds Science Stories.
Imran Ghory submitted a cite from a 1955 reprint of J. Francis McComas' "Shock Treatment"; we would like to check the 1954 first edition.
Katrina Campbell submitted a 1980 cite from Malcolm Edwards and Robert Holdstock's "Tour of the Universe".
Douglas Winston submitted a 1966 cite from Murray Leinster's "Quarantine World".
Douglas Winston submitted a 1988 cite from Kevin Randle and Robert Cornett's "The Aldebaran Campaign".
Douglas Winston submitted a 1967 cite from Patrick Meadows' "Virtue. 'Tis a Fugue!".
Mike Christie submitted a 1941 cite from Robert Heinlein's "Methuselah's Children".

Last modified 2020-12-16 04:08:47
In the compilation of some entries, HDSF has drawn extensively on corresponding entries in OED.