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

Mars is bitterly cold, and its thin atmosphere and long-dead magnetic field leave the surface open to deadly radiation (both from the sun and from deep space). — Kiona N. Smith, Space.com, 17 Sep. 2026

Shipping heavy construction materials like steel or concrete across millions of miles of deep space is financially absurd. — Mrigakshi Dixit, Interesting Engineering, 10 Sep. 2026

Sign Up for Our Free Daily Newsletter NASA’s newest telescope is officially on its way to deep space after more than a decade of development and high anticipation. — Claire Cameron, Scientific American, 30 Aug. 2026

The rocket was left flying in deep space after launching a commercial Moon lander in 2025. — Stephen Clark, ArsTechnica, 21 Aug. 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