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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
It has been talked about for quite a while, and some scientists even believe that life on Earth may have arrived through panspermia, originating somewhere in deep space before being brought to our planet.
—Monisha Ravisetti, Space.com, 16 Jan. 2025
SpaceX’s Starship achieved its first successful landing, which is a critical milestone for future deep space missions.
—Zhenbo Wang, Discover Magazine, 31 Dec. 2024
Rapid reuse will be essential if SpaceX wants to reach its goal of dramatically reducing the time and cost of getting cargo and people into orbit and to deep space.
—Marta Musso, WIRED, 14 Oct. 2024
Old-school radios convert currents into sound, but radio telescopes record the current to construct a picture of deep space.
—Matthew Hutson, The New Yorker, 24 Sep. 2024
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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 5 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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