deep space
Refers to the vast regions of outer space beyond Earth's immediate vicinity, often used in astronomy and space exploration contexts.
Deep space exploration requires advanced technology.
Observe signals from deep space.
Compound of 深 (しん, 'deep') and 宇宙 (うちゅう, 'space'). The term is a direct translation of the English 'deep space' and is used in scientific and technical contexts.