deep space


Definition of 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 European Southern Observatory is in the midst of constructing the Extremely Large Telescope with a 39-meter-wide main mirror, the largest of its kind, which will provide an increasingly intimate glimpse into deep space. Popular Science, "This ominous image shows the birth of a planet," 21 May 2020 At the time, NASA heralded the test as the beginning of a robust deep space exploration. Eric Berger, Ars Technica, "China’s largest rocket takes flight with its next-generation spacecraft," 5 May 2020 Science + Tech = MACH Visitors from deep space are buzzing our solar system. Petra Cahill, NBC News, "Rep. Elijah Cummings dies, a new Brexit deal, and Sondland to be grilled about private Ukraine chat: The Morning Rundown," 17 Oct. 2019 The outer reaches of deep space feel closer than ever before. Jennifer Leman, Popular Mechanics, "The Deep Space Decade: How a New Era of Exploration Came of Age in the 2010s," 31 Dec. 2019 Some quickly return to the surface like a cannonball, while others escape into the vast emptiness of deep space. Wired, "No One Knows Why Rocks Are Exploding From Asteroid Bennu," 5 Dec. 2019 Antonelli says the company plans to use some of the same instruments as Orion, which have been built for Orion and already made to withstand the harsh radiation environment of deep space. Loren Grush, The Verge, "This is Lockheed Martin’s idea for a reusable lander that carries people and cargo to the Moon," 3 Oct. 2018 At places where light rays from the external spotlights cross each other, your bodily shadow warps and darkens to create a faint illusion of deep space. Los Angeles Times, "Review: In Mary Corse’s light paintings at LACMA, some shadows," 5 Aug. 2019 Looking at Earth from deep space, seeing the massive void that surrounded them, just rewired their brains. David Shribman, San Diego Union-Tribune, "Column One: 50 years after Apollo 11, the moon’s allure still resonates," 11 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'deep space.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of deep space

circa 1952, in the meaning defined above

Keep scrolling for more

Learn More about deep space

Time Traveler for deep space

Time Traveler

The first known use of deep space was circa 1952

See more words from the same year

Statistics for deep space

Last Updated

26 May 2020

Cite this Entry

“Deep space.” Dictionary, Merriam-Webster, Accessed 26 May. 2020.

Comments on deep space

What made you want to look up deep space? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

Obscure Shapes

  • a pile of three dimensional shapes in green
  • Something that is ooid is shaped like:
Spell It

Can you spell these 10 commonly misspelled words?

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!