Adjective
Between planets; as, interplanetary spaces.
Source: Webster's dictionaryThe nations of the world will have to unite for the next war will be an interplanetary war. The nations of Earth must some day make a common front against attack by people from other planets. Douglas MacArthur
See? Interstellar colonization is easy! You just need to devote a visible percentage of the resource of an entire interplanetary civilization to it for several hundred years, placing it in the tireless and efficient hands of robots ordered to strive for the goal for as long as it takes. Charles Stross
Man is the animal that intends to shoot himself out into interplanetary space, after having given up on the problem of an efficient way to get himself five miles to work and back each day. Bill Vaughan
By the time I'm 40, interplanetary travel will be common. Nobody will want to talk to me at that age, anyway. Ace Frehley
The law of revolution is red, fiery, deadly; but this death means the birth of new life, a new star. And the law of entropy is cold, ice blue, like the icy interplanetary infinities. The flame turns from red to an even, warm pink, no longer deadly, but comfortable. Yevgeny Zamyatin
(Sylvia driving to nervous passenger Venusian Gernif) Don't be silly. You're not going to be the first interplanetary traveler to die in a Chevy. Nicole Hollander