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
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With no functional magnetosphere, Mars’ surface radiation is nearly as intense as in deep space, and the paper-thin atmosphere provides little protection from even minuscule meteorites.
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Big Think, 19 Feb. 2026
Wiseman and his crewmates will also be the first to ride into space atop the 322-foot-tall Space Launch System rocket, making only its second flight, and the first to fly aboard an Orion deep space crew capsule.
—William Harwood, CBS News, 19 Feb. 2026
Future missions taking shape at Goddard include spacecraft to explore Venus and Saturn’s moon Titan, and a new telescope to search for planets that might hold life in deep space.
—Brittany Allen, Literary Hub, 13 Feb. 2026
The company is positioning the system for deep space science missions, lunar surface operations, and high-value defence satellites, aiming to offer a lighter and more fuel-efficient alternative to decades-old RTG technology.
—Neetika Walter, Interesting Engineering, 11 Feb. 2026
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Big Think, 19 Feb. 2026
Wiseman and his crewmates will also be the first to ride into space atop the 322-foot-tall Space Launch System rocket, making only its second flight, and the first to fly aboard an Orion deep space crew capsule.
—William Harwood, CBS News, 19 Feb. 2026
Future missions taking shape at Goddard include spacecraft to explore Venus and Saturn’s moon Titan, and a new telescope to search for planets that might hold life in deep space.
—Brittany Allen, Literary Hub, 13 Feb. 2026
The company is positioning the system for deep space science missions, lunar surface operations, and high-value defence satellites, aiming to offer a lighter and more fuel-efficient alternative to decades-old RTG technology.
—Neetika Walter, Interesting Engineering, 11 Feb. 2026
See All Example Sentences for deep space
Cite this Entry
“Deep space.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/deep%20space. Accessed 22 Feb. 2026.
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