interplanetaryadj.

a1691 R. Boyle Gen. Hist. Air (1692) 1 The air..is different from the æther (or vacuum) in the..interplanetary spaces.

1846 W. R. Grove On Correlation Physical Forces 31 Of the existence of matter in the interplanetary spaces, we have some evidence.

1880 S. Haughton Six Lect. Physical Geogr. i. 5 Meteoric stones, which enter the earth's atmosphere from the interplanetary spaces.

1897 Pearson's Mag. July 116/1 Cylinder followed cylinder in its interplanetary flight.

1901 Daily News 7 Jan. 5/1 Dreams of inter-planetary communication.

1931 D. Lasser Conquest of Space 13 Ignorance and prejudice..surround the ‘interplanetary rocket’ question.

1936 ‘J. Beynon’ Planet Plane iii. 28 Mr. Curtance is going to try to win the Keuntz Prize for the inter-planetary flight.

1943 C. S. Lewis Perelandra vi. 91 In obscure works of ‘scientification’, in little Interplanetary Societies and Rocketry Clubs.

1950 Jrnl. Brit. Interplanetary Soc. 9 300 Should be able to take the Interplanetary Age, when it comes, without hysteria.

1957 Economist 2 Nov. 377 The artificial satellite circling the earth was to be a proud reminder of the distance covered along the road from the wooden plough to the inter-planetary rocket.

1960 Analog Sci. Fact & Fiction Oct. 30/1 Maybe they were bravely defending their own planet by hunting down an interplanetary raider.

1962 Daily Tel. 31 Aug. 21/3 Prof. Egorov said..‘Interplanetary stations..will serve for refuelling cosmic ships and so on. I think these cosmic flights are one more stage in making man master of cosmic space in flights round the earth and other planets.’