interplanetary

What it means

1. not comparableExisting or occurring between planets.

   Humans are just beginning to explore interplanetary travel.

   4 more examples

   "Come, Diana [a dog]," said he; "come, my girl! thou whose destiny will be marked in the cynegetic annals; […] thou who art rushing into interplanetary space, and wilt perhaps be the Eve of all Selenite dogs! come, Diana, come here."

   1873, Jules Verne, “Round the Moon: A Sequel to From the Earth to the Moon. Chapter III. Their Place of Shelter.”, in Louis Mercier [i.e., Lewis Page Mercier], Eleanor E[lizabeth] King, transl., From the Earth to the Moon, Direct in Ninety-seven Hours and Twenty Minutes: And a Trip Round It. […], New York, N.Y.: Scribner, Armstrong & Company, published 1874, →OCLC, page 170

   Him and me, we kind of got to toasting each others good health. Just for cordial interplanetary relations you understand.

   1956, Cyril Hume, Forbidden Planet, spoken by Cook

   Calling occupants of interplanetary craft / Calling occupants of interplanetary / Most extraordinary craft / We've been observing your Earth / And one night we'll make a contact with you

   1976, “Calling Occupants of Interplanetary Craft”, in 3:47 EST, performed by Klaatu

   This is the return of the space cowboy / Interplanetary good vibe zone

   1994, “Space Cowboy”, in The Return of the Space Cowboy, performed by Jamiroquai

In a sentence

Humans are just beginning to explore interplanetary travel.

Where it comes from

1. Proto-Indo-European*h₁én
2. Proto-Indo-European*h₁n̥tér
3. Proto-Italic*n̥ter
4. Latininter
5. Latininter-
6. Englishinter-
7. Englishplanet
8. Englishplanetary
9. Englishinterplanetary

From inter- + planetary.