deep space

noun

: space well outside the earth's atmosphere and especially that part lying beyond the earth-moon system

Examples of deep space in a Sentence

Recent Examples on the Web
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Glover will become the first Black man to travel to deep space, Koch the first woman and Hansen the first non-American. Richard Tribou, The Orlando Sentinel, 11 Apr. 2026 So Artemis 2 was the first mission to fly four people to deep space, as well as the first to send a bona fide toilet beyond Earth orbit. Mike Wall, Space.com, 11 Apr. 2026 Following liftoff on April 1, the 10‑day mission sent four astronauts on a flyby around the moon, testing life‑support, navigation and propulsion systems in deep space without landing, NASA said. Doyle Rice, USA Today, 11 Apr. 2026 With the Artemis mission, Koch has become the first woman to venture into deep space and journey around the moon; her colleague, Victor Glover, is the first Black man to do the same. Stephanie McNeal, Glamour, 9 Apr. 2026 See All Example Sentences for deep space

Word History

First Known Use

1865, in the meaning defined above

Time Traveler
The first known use of deep space was in 1865

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Cite this Entry

“Deep space.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/deep%20space. Accessed 13 Apr. 2026.

Kids Definition

deep space

noun
: space outside the earth's atmosphere and especially that part lying beyond the earth-moon system
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