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Synonyms

interplanetary space

American  
[in-ter-plan-i-ter-ee spays] / ˌɪn tərˈplæn ɪˌtɛr i ˈspeɪs /

noun

  1. Astronomy. the space between planets.

interplanetary space Scientific  
/ ĭn′tər-plăn′ĭ-tĕr′ē /

  1. See under space

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Meanwhile, an interplanetary space race between the U.S.,

From The Wall Street Journal • Mar. 30, 2026

Later, during the 10 month journey to Mars, the spacecraft will continue studying the solar wind and the magnetic conditions of interplanetary space.

From Science Daily • Mar. 14, 2026

This relentless high-speed flow of charged particles from the sun fills interplanetary space.

From Reuters • Aug. 24, 2023

Solar sails have, of course, been built and successfully launched on proof-of-concept missions in both interplanetary space and low-Earth orbit.

From Scientific American • Aug. 23, 2022

But these are the laws our planet obeys as we ourselves, glued by gravity to the surface of the Earth, hurtle through interplanetary space.

From "Cosmos" by Carl Sagan

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.