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.
The race to make possible things like deep space travel, AI, stem cell and other advancements gives hope that even in a few decades, a thawing could be possible. Mike Fleming Jr, Deadline, 20 Oct. 2025 The end result is a magnificent snapshot of deep space, created from particles of light that had travelled thousands of years to reach their destination. Anthony Wood, Space.com, 19 Oct. 2025 Almost all spacecraft sent to deep space — including the Voyager probes, Juno, Cassini-Huygens, and Galileo — must execute gravity assist maneuvers, slingshotting around planets to gain velocity for their vast treks. Big Think, 15 Oct. 2025 Such a step is necessary for the vehicle to make trips into deep space given its design and enormous size — but it has never been attempted before with any spacecraft. Jackie Wattles, CNN Money, 14 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 22 Oct. 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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