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.
To discover what sort and in particular whether it supported an Earth-type planet required a close approach at reasonably low speed.
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.
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.
That plant is now grown under government supervision on all Earth-type planets.
It’s Earth-type, oxygen, and the climate’s fine so far.
We thought we’d look in and check on conditions, as well as resting ourselves on an Earth-type world.
‘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.’
In this outer rim of the galaxy with its sparse star population, the explorer team was overjoyed to find an earth-type planet.
Altuxor iv—otherwise known as Vandezande’s World or Kameleos—is Earth-type, though breathing apparatus is required.
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.
The search was soon switched to Earthtype planets, and these proved difficult to find.
Robert A. Heinlein, 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.