interplanetary
adj. B2 Upper Intermediate US //ˌɪntɝˈpɫænəˌtɛɹi// UK //ˌɪntəplˈænɪtəɹi// in·ter·plan·e·tary
adj. relating to travel or communication between different planets. You use this to describe things that move or exist in space between worlds.
adj. relating to or occurring between planets. Typically describes travel, communication, or phenomena that span the space between celestial bodies.
The probe is designed for interplanetary travel.
Scientists are developing new propulsion systems to make interplanetary missions faster and more efficient.
The discovery of microbial fossils in Martian soil would represent the first evidence of interplanetary contamination, fundamentally altering our understanding of the origins of life in the solar system.
From inter- + planetary.