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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
Shorter flight times could reduce these risks, making the possibility of deep space human spaceflight closer to reality.
—
Julian Dossett, Space.com, 9 Feb. 2025
Scientists would need deep space radar observations, thermal infrared observations, or imagery from a spacecraft that could closely approach the asteroid, according to the IAWN.
—
Stephen Clark, Ars Technica, 6 Feb. 2025
In Argentina, for instance, China operates a deep space station that has raised concerns among U.S. defense officials about the possibility it could be used to track U.S. satellites.
—
Roger W. Ferguson, Foreign Affairs, 30 Jan. 2025
However, the outlet noted that disclosing artificial bodies’ trajectories in deep space is not standard.
—
Eric Lagatta, USA TODAY, 24 Jan. 2025
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Word History
First Known Use
1865, in the meaning defined above
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 16 Feb. 2025.
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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