intersidereal
interstellary

Never before had I understood the true awfulness of intersidereal depth and distance, of the gulf wherein there is neither limitation nor direction.

When he ceased, Alvor realized that they were walled about with an insulating silence utter and absolute as that of some intersidereal void.

Thus, some time after the return of the travelers, the public received with marked favor the announcement of a company, limited, with a capital of a hundred million of dollars, divided into a hundred thousand shares of a thousand dollars each, under the name of the "National Company of Interstellary Communication."