n. pl. at·mo·spher·i·a (-ē-ə)
An optical device designed to project images of atmospheric phenomena, such as clouds, on the inside of a dome.

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Meteor specialist Paul hopes to find astral-rock fragments chock-full o' radioactive "atmospherium."
Meanwhile, Kro-Bar (Andrew Parks) and Lattis (Susan McConnell) from Planet Marva require atmospherium, too, to repair their disabled spaceship.