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

However, evidence of an ancient alien civilization and a frantic distress call from deep space instantly cut those celebrations short. — Paul Brett, Space.com, 10 July 2026

Glover will become the first Black man to travel to deep space, Koch the first woman and Hansen the first non-American. — Richard Tribou, The Orlando Sentinel, 9 July 2026

Nuclear batteries have been deployed in deep space missions by NASA in its Voyager probes in 1977 and Mars Curiosity rover in 2012. — Ameya Paleja, Interesting Engineering, 8 July 2026

Lockheed Martin is helping shape the next era of deep space exploration, from humanity’s return to the Moon to the long-term goal of reaching Mars. — Paid Content By Lockheed Martin, FOXNews.com, 23 June 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