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 Astronomers refer to the distances in the universe as happening in deep space. Erik Klemetti, Discover Magazine, 7 Mar. 2024 This will be the first time this particular kind of electric engine, called a Hall effect thruster, has flown on a deep space mission. Stephen Clark, Ars Technica, 13 Oct. 2023 Understanding how a crew reacts to the challenges of a deep space mission is essential for planning how astronauts will explore the red planet. Ashley Strickland, CNN, 21 Feb. 2024 Enlist in a mission to deep space, says two movies! Sandman Is Spaceman, Vulture, 16 Jan. 2024 The program will see NASA more often partnering with private companies to help place scientific payloads on the lunar surface, freeing the space agency up to focus on building spacecraft and rockets for deep space missions. Eric Lagatta, USA TODAY, 5 Jan. 2024 Celestis already has plans in the works for another deep space voyage flight to be launched sometime between 2025 and 2027 and plans for another lunar service launch sometime in 2025 and 2026. The Indianapolis Star, 5 Jan. 2024 Enlarge / Taters, the orange tabby cat of a Jet Propulsion Laboratory employee, stars in a video beamed from deep space by NASA's Psyche spacecraft. Stephen Clark, Ars Technica, 30 Dec. 2023 The video was sent by NASA’s Deep Space Optical Communications flight laser transceiver, which hitched a ride to deep space on Psyche, a spacecraft on a mission to the main asteroid belt between Mars and Jupiter. Justine McDaniel, Washington Post, 19 Dec. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'deep space.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1865, in the meaning defined above

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

Dictionary Entries Near deep space

Cite this Entry

“Deep space.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/deep%20space. Accessed 18 Mar. 2024.

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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