Deep Space
Definition
Deep space generally refers to areas beyond Earth’s orbit and cislunar space, specifically space at distances from the Earth equal to, or greater than, 2 × 106 km, although some definitions also consider the Moon to be part of deep space.
A Lexicon for Outer Space SecurityUnited Nations Institute for
Disarmament ResearchPalais des Nations
1211 Geneva 10
Switzerland
1211 Geneva 10
Switzerland
Phone:+41 (0)12 345 5678
E-mail:unidir@un.org