outer space

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any region of space beyond limits determined with reference to the boundaries of a celestial body or system, especially.
• noun The region of space immediately beyond Earth's atmosphere.
• noun Interplanetary or interstellar space.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Region outside explored space.
• noun Any region of space beyond limits determined with reference to boundaries of a celestial system or body, especially the region of space immediately beyond Earth's atmosphere
• noun A bluish shade of black

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any location outside the Earth's atmosphere