Space platform: A man-made satellite rotating around Earth between here and the Moon. Scientists say this is a necessary first step to interplanetary travel. Mars Confidential proves the fallacy of this theory.

Space Academy: A college where young men are trained to be spacemen. The student body consists mainly of cadets who served apprenticeships as elevator jockeys.

Asteroids: Tiny worlds floating around in space, put there no doubt to annoy unwary space ships.

Extrapolation: The process by which a science-fiction writer takes an established scientific fact and builds thereon a story that couldn't happen in a million years, but maybe 2,000,000.

Science fiction: A genre of escape literature which takes the reader to far-away planets—and usually neglects to bring him back.

S.F.: An abbreviation for science fiction.

Bem: A word derived by using the first letters of the three words: Bug Eyed Monster. Bems are ghastly looking creatures in general. In science-fiction yarns written by Terrans, bems are natives of Mars. In science-fiction yarns written by Martians, bems are natives of Terra.

The pile: The source from which power is derived to carry men to the stars. Optional on the more expensive space ships, at extra cost.

Atom blaster: A gun carried by spacemen which will melt people down to a cinder. A .45 would do just as well, but then there's the Sullivan Act.

Orbit: The path of any heavenly body. The bodies are held in these orbits by natural laws the Republicans are thinking of repealing.