deep space

American

noun

space beyond the limits of the solar system.

deep space British

noun

any region of outer space beyond the system of the earth and moon

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Derived Forms

deep-space

adjective

Etymology

Origin of deep space

First recorded in 1950–55

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Previous work led by LMU physicist Dr. Giulia Roccetti showed that giant planets ejected from their systems may still retain some of their moons after being thrown into deep space.

From Science Daily • May 29, 2026

Victor Glover became the first black astronaut to reach deep space; Christina Koch the first woman; Jeremy Hansen the first Canadian.

From BBC • Apr. 16, 2026

Unlike earlier missions, Artemis is designed with longer-term goals in mind, including future crewed landings and the development of infrastructure that could support deep space exploration.

From Salon • Apr. 11, 2026

The four astronauts took thousands of photographs throughout their journey, amassing a stunning portfolio of images from deep space.

From Barron's • Apr. 10, 2026

Everyone now began to imagine looking at the Earth from deep space.

From "The Invention of Science" by David Wootton

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023