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Definitions

interstellar space

[in-ter-stel-er spays] / ˌɪn tərˈstɛl ər ˈspeɪs /
NOUN
deep space
Synonyms
WEAK
celestial spaces cosmic space cosmos intercosmic space intergalactic space interplanetary space metagalactic space ocean of emptiness outer space region beyond Earth's solar system the heavens the universe the void the void above
NOUN
outer space
Synonyms
STRONGEST
cosmos
WEAK
celestial spaces cosmic space deep space empty space ether space infinite space infinity intercosmic space intergalactic space interplanetary space metagalactic space ocean of emptiness pressureless space the heavens the void the void above

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.

If you were starting today, going to the moon or anywhere beyond, and especially into interstellar space, would be a job for robots and, often, exclusively robots.

From The Wall Street Journal • Feb. 10, 2026

"We think there's a two-thirds chance this comet is older than the solar system, and that it's been drifting through interstellar space ever since."

From BBC • Jul. 11, 2025

Voyager 2 crossed the border to interstellar space in 2018.

From New York Times • Jun. 14, 2024

Somewhere in the cold interstellar space between our sun and the closest stars, its flight data system stopped communicating with the part of the probe that allows it to send signals back to Earth.

From Los Angeles Times • Apr. 23, 2024

As the solar system condensed out of instellar gas and dust, Jupiter acquired most of the matter that was not ejected into interstellar space and did not fall inward to form the Sun.

From "Cosmos" by Carl Sagan