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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
While physicists are hunting for dark matter in the laboratory, astronomers have their own strategies for looking for evidence of dark matter in deep space.
—Dan Falk, Smithsonian Magazine, 25 Oct. 2024
For what Spirit and Opportunity proved is that there’s little of value that humans can do in deep space that robots can’t do as well, or better.
—Michael Hiltzik, Los Angeles Times, 16 Oct. 2024
But for future missions to deep space, astronauts will stray far from Earth’s protection and will need to rely on a well-shielded spacecraft and protective spacesuits.
—Ashley Strickland, CNN, 19 Sep. 2024
Quickly reusing rocket parts is considered essential to SpaceX’s goal of drastically reducing the time and cost of getting cargo — or ships of people — to Earth’s orbit and deep space.
—Jackie Wattles, CNN, 13 Oct. 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 8 Nov. 2024.
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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