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exoatmospheric
exoatmospheric adj.
Brit. 
/ˌɛksəʊatməsˈfɛrɪk/
, /ˌɛksəʊatməsˈfɛrɪk/U.S. /ˌɛksoʊˌætməˈsfɪrɪk/
occurring or working outside the atmosphere./ˌɛksoʊˌætməˈsfɪrɪk/ΚΠ
1966 Economist 5 Mar. 898/1 A ‘new, long-range exoatmospheric interceptor’ to which the short-range Sprint missile would be a supplement.
1967 Listener 9 Feb. 185/2 The resulting pulse of radiation should make almost everything in range boil; this would happen beyond the atmosphere and the principle is called exoatmospheric interception.
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