noun, noun which may take the genitive case particle 'no'
outside Earth's atmosphere; outer space; exoatmosphere
Refers to the region beyond Earth's atmospheric envelope. Used in scientific and technical contexts, as well as in general descriptions of space.
大気圏外では、空気がないため音は伝わらない。
Outside Earth's atmosphere, sound does not travel because there is no air.
その衛星は大気圏外の軌道を周回している。
The satellite orbits in outer space.
Compound of 大気圏 (atmosphere) + 外 (outside). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning 'outside the atmosphere'.