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What is outer space?

What is outer space? Here are some definitions.

Noun
  1. Region outside 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.
  3. A bluish shade of black.
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Examples
And what they find is a long sequence of prime numbers that comes to earth from outer space as a radio signal.
We are being cudgeled into agreeing to wars of aggression, to make first use of nuclear weapons and to put weapons in outer space.
The spectra that are observed indicate that small molecules, such as cyanide, methane, and cyanogen, can assemble in outer space.
And small wonder it fired the imagination of the sci-fi immigrants, who imagined a new frontier in outer space.
They were able to fly in unnoticed thanks to the cover of perpetual darkness that was provided by outer space.
The eccentric singer reportedly came up with the idea after dreaming he met little green men from outer space.

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