[ ek-struh-plan-i-ter-ee ]
/ ˌɛk strəˈplæn ɪˌtɛr i /
existing or occurring in outer space beyond a planet, especially away from the planet Earth.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for extraplanetary
Not necessarily, but it seems our iron-age man is fairly well informed in extraplanetary affairs.Blessed Are the Meek|G.C. Edmondson