Time machine: A machine that carries you back to yesterday and into next year. Also, an alarm clock.
Time warp: The hole in time the time machine goes through to reach another time. A hole in nothing.
Terra: Another name for Earth. It comes from terra firma or something like that.
Hyperdrive: The motor that is used to drive a space ship faster than the speed of light. Invented by science-fiction writers but not yet patented.
Ether: The upper reaches of space and whatever fills them. Also, an anaesthetic.
Luna: Another name for the Moon. Formerly a park in Coney Island.