Nova: The explosive stage into which planets may pass. According to the finest scientific thinking, a planet will either nova, or it won't.
Galaxy: A term used to confuse people who have always called it The Milky Way.
Sun spots: Vast electrical storms on the sun which interfere with radio reception, said interference being advantageous during political campaigns.
Atomic cannons: Things that go zap.
Audio screen: Television without Milton Berle or wrestling.
Disintegrating ray: Something you can't see that turns something you can see into something you can't see.
Geiger counter: Something used to count Geigers. Interstellar space: Too much nothing at all, filled with rockets, flying saucers, advanced civilizations, and discarded copies of Amazing Stories.
Mars: A candy bar.
Pluto: A kind of water.
Ray guns: Small things that go zap.