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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Every observation out into deep space is also a look back in time. Big Think, 24 Nov. 2025 There, for at least 15 weeks, the worms and other microbial samples will face the combined wrath of microgravity, the vacuum of space, and deep space radiation. Mrigakshi Dixit, Interesting Engineering, 21 Nov. 2025 But now both productions appear to be stranded in deep space with life support failing. Brent Lang, Variety, 14 Nov. 2025 Callingham and colleagues at the European Space Agency (ESA) first suspected their potential interstellar CME after the LOFAR telescope array detected a short, intense radio signal emission from deep space. Andrew Paul, Popular Science, 12 Nov. 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 25 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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