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not comparable
Of or in the area of space beyond the gravitational influence of Earth, or outside the Solar System quotations examples
Bradley swore a mighty deep-space oath and braced himself against certain annihilation.
1934 April, E. E. "Doc" Smith, “Triplanetary”, in Amazing Stories, volume 6, number 5, page 54
Human exploration of the solar system beyond Earth's orbit will entail many risks for the crew on these deep space missions.
2005, Lawrence W. Townsend, “Implications of the space radiation environment for human exploration in deep space”, in Radiation Protection Dosimetry, volume 115, pages 44–50
uncountable
All of space beyond the gravitational influence of Earth, or outside the Solar System, or distant from stars quotations examples
Part of the time he spent in the speedster dashing hither and yon. Most of it, however, he spent in the vastly more comfortable mauler; to the armored side of which his tiny vessel clung with magnetic clamps while he slept and ate, gossiped and read, exercised and played with the mauler's officers and crew, in deep-space comradery.
1937 December, E. E. "Doc" Smith, “Galactic Patrol”, in Astounding Science-Fiction, volume 20, number 4, page 73