deep space


: 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 Astronomers have detected an extremely brief flash of radio waves called a fast radio burst (FRB) that originated in deep space eight billion years ago. Will Sullivan, Smithsonian Magazine, 1 Nov. 2023 Enlarge / The Falcon Heavy rocket's two side boosters returned to Cape Canaveral for landing after sending NASA's Psyche spacecraft on its way into deep space. Eric Berger, Ars Technica, 20 Oct. 2023 China is not alone in elevating its space program and lunar ambitions as multiple countries eye the potential scientific benefit, national prestige and access to resources and further deep space exploration that successful moon missions could bring. Kathleen Magramo, CNN, 4 Oct. 2023 Radium will be this rocket engine’s deep space fuel, said Dr. Tabitha Dodson. Lee Roop |, al, 26 July 2023 The waves likely emanated from pairs of some of the most gigantic black holes in the universe and jostled other deep space objects enough to create a subtle signal that scientists could pick up. WIRED, 29 June 2023 In 2021, president Xi Jinping delivered a speech to the country’s scientific community outlining four areas in which to focus their efforts: deep Earth, deep sea, deep blue (meaning information technology), and deep space. Julia Malleck, Quartz, 2 June 2023 An experimental communication system is also along for the ride, using lasers instead of radio waves in an attempt to expand the flow of data from deep space to Earth. TIME, 13 Oct. 2023 During the first two years of its flight, Psyche will also host the Deep Space Optical Communications experiment, a separate project testing laser communication technology in deep space. Meghan Bartels, Scientific American, 13 Oct. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'deep space.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1865, in the meaning defined above

Time Traveler
The first known use of deep space was in 1865

Dictionary Entries Near deep space

Cite this Entry

“Deep space.” Dictionary, Merriam-Webster, Accessed 3 Dec. 2023.

Kids Definition

deep space

: 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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