deep space

American  

noun

1. space beyond the limits of the solar system.

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deep space British  

noun

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

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Other Word Forms

• deep-space adjective

Etymology

Origin of deep space

First recorded in 1950–55

Example Sentences

Artemis III will stick in near-Earth orbit — closer to where the International Space Station sits as opposed to traveling into deep space like Artemis II.

From Los Angeles Times • Apr. 12, 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

"We continue to learn all about our spacecraft as we operate it in deep space with crew for the first time," Hawkins said.

From Barron's • Apr. 3, 2026

Most people are familiar with the idea of deep space, but scientists also study something called deep time.

From Science Daily • Mar. 14, 2026

“Maybe it’s one of those towers that tries to make contact with deep space or track weather.”

From "Beauty Queens" by Libba Bray