Obs. made of anti-matter. Compare seetee, terrene.
- 1941 R.S. Richardson Inside Out Matter Astounding S-F (Dec.) № 112/1: Contraterrene means just that — a type of matter exactly the opposite of ordinary or terrene matter. Instead of atoms composed of a positive nucleus surrounded by electrons, it consists of a negative nucleus surrounded by positrons.
- 1943 W. Stewart Opposites — React! Astounding S-F (Jan.) № 11/2: That needle would seem to be an artifact — think of it — of contraterrene life!
- 1946 J.J. Coupling Astounding SF (May) № 105: We've known about atoms with protons and electrons for a long time; there have been suggestions of atoms with inverted structure — contraterrene atoms.
- 1958 Journal of British Interplanetary Society Vol. XVI № 540: Some of the larger meteor craters found on the Earth's surface [...] may have been due, not so much to meteors of earthlike matter and great size, but rather to the impact of anti-matter or contraterrene material.
