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.
In any case, the Super Heavy-Starship rocket is expected to play a major role in future deep space exploration, regardless of the target. William Harwood, CBS News, 27 May 2025 Both probes are still flying out into deep space today. Rebecca Hersher, NPR, 26 May 2025 The Accords represent a set of principles and guidelines designed to shape how nations explore the moon and deep space. Josh Dinner, Space.com, 15 May 2025 The mission's total cost adds up to more than $1.4 billion, including development of the spacecraft and its instruments, the launch, operations, and an experimental laser communications package hitching a ride to deep space with Psyche. ArsTechnica, 1 May 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 4 Jun. 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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