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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Cursed with incredible longevity, Mawukana na-Vdnaze can pilot sentient ships in deep space without going mad; death is an evolution rather than an end. Literary Hub, 3 Nov. 2025 And then there is the research on the astronauts themselves that could have knock-on effects both for helping crews stay healthier on long-duration deep space missions, and also provide new clues to the riddle of aging—and perhaps slow it down. Jeffrey Kluger, Time, 31 Oct. 2025 Researchers also hope to understand how interstellar comets survive the harsh conditions of deep space. Hannah Parry, MSNBC Newsweek, 29 Oct. 2025 From its gravitationally stable vantage point at Lagrange Point 2, the JWST is tasked with peering into deep space to capture ancient light from the early universe and observe the formation of stars, protoplanetary systems and so much more. Anthony Wood, Space.com, 25 Oct. 2025 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 8 Nov. 2025.

Kids Definition

deep space

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