outer space

Noun

1. A region outside of explored space.
2. 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; sometimes, space beyond Earth's solar system.
   • Astronauts train for years before traveling to outer space.
   • The telescope captured incredible images from outer space.
   • Science fiction often imagines alien civilizations in the depths of outer space.

   Synonyms: final frontier high frontier last frontier

3. A bluish shade of black.