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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Images from the world’s largest camera, built in the Bay Area, have just been released, providing a first-of-its-kind window across deep space. Ethan Baron, Mercury News, 24 June 2025 The watch represents a journey inside deep space, and the artistic elements of it reflect Dr. Woo’s single-needle style of inking. Roberta Naas, Forbes.com, 18 June 2025 The lander is carrying a water electrolyzer experiment, which aims to produce hydrogen and oxygen from the moon’s water molecules; a food production experiment testing ways to grow algae on the moon; a deep space radiation probe; and a rover named Tenacious. Sara Hashemi, Smithsonian Magazine, 5 June 2025 Nuclear electric propulsion would provide another leap in engine efficiency beyond the capabilities of a system like DRACO and may ultimately offer the most attractive option for enduring deep space transportation. Stephen Clark – Jun 3, ArsTechnica, 3 June 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 1 Jul. 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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