interplanetary

adjective
in·​ter·​plan·​e·​tary | \ˌin-tər-ˈpla-nə-ˌter-ē \

Definition of interplanetary 

: existing, carried on, or operating between planets interplanetary dust an interplanetary flight interplanetary spacecraft

First Known Use of interplanetary

1691, in the meaning defined above

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The first known use of interplanetary was in 1691

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