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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Radio observatories designed to detect extremely faint signals from deep space now have to cope with interference from large satellite constellations. Jamie Carter, Forbes.com, 13 June 2026 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, 12 June 2026 The goal, according to NASA, is to test how the spacecraft operates in deep space, with the bonus that this marks the furthest a crew has ever traveled from Earth, breaking the previous record set by the Apollo 13 mission. Karla Cote, Variety, 10 June 2026 Putting railguns on the moon isn't a new idea, and was most recently proposed by SpaceX as a means of launching thousands of AI data center satellites into deep space. Leonard David, Space.com, 28 May 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 17 Jun. 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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