Between or among the stars: interstellar gases. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "interstellar" in a sentence
"So many years without hard, physical evidence; the extreme unlikeliness of a successful cover-up that spans over fifty years, one that would involve not only multiple U.S. administrations, but numerous foreign governments; the distances involved in interstellar travel ..."
"FOPS provides a wide-ranging reference for researchers who are starting out in interstellar propulsion."
"Carl Sagan: The spacecraft will be encountered and the record played only if there are advanced spacefaring civilizations in interstellar space."