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

Derived Forms

• deep-space
  adjective

Etymology

Origin of deep space

First recorded in 1950–55

Example Sentences

Scientists determined the object had entered the solar system from deep space, making it the third known object to have come from another star system.

From Los Angeles Times • Jun. 6, 2026

This shows how China is building its expertise in long stays in space as well as deep space exploration, de Grijs said.

From BBC • May 25, 2026

The chip could also help deep space missions process, store, and transmit massive amounts of scientific data back to Earth more efficiently.

From Science Daily • May 15, 2026

While hurtling through deep space and zipping around the Moon, the Artemis astronauts took thousands of photographs, amassing a stunning portfolio of images.

From Barron's • Apr. 11, 2026

A lot of the time I’d get that feeling like I was in the middle of a huge black ocean, or in deep space, but not in the fascinating way.

From "Extremely Loud and Incredibly Close" by Jonathan Safran Foer