deep space

noun

: 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

Propulsion systems are being reimagined for deep space missions, while energy platforms are being designed not only to decarbonize but to autonomously adapt to demand and solve our deep climate issues. —CBS News, 22 Jan. 2026

Set in deep space in the far future, the show first aired in January 1978 and was shown on BBC One. —Scott Snowden, Space.com, 22 Jan. 2026

Radiation sensors on the crew and inside Orion will study the impact of radiation in deep space. —Matthew Glasser, ABC News, 20 Jan. 2026

The mission serves as a final, integrated checkout before crews move from testing systems to operating in deep space—under modern safety expectations shaped by decades of experience and a world in which human spaceflight is no longer limited to government astronauts. —Charlotte Kiang, Forbes.com, 19 Jan. 2026

Word History

First Known Use

1865, in the meaning defined above

Rhymes for deep space

• abase
• airspace
• apace
• backspace
• biface
• birthplace
• blackface
• boldface
• bookcase
• braincase
• briefcase
• carcase

Kids Definition

deep space

noun

: space outside the earth's atmosphere and especially that part lying beyond the earth-moon system