intergalactic

[in-ter-guh-lak-tik]
adjective
of, existing, or occurring in the space between galaxies: The science-fiction movie was about an intergalactic war.

Origin:
1925–30; inter- + galactic

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World English Dictionary
intergalactic (ˌɪntəɡəˈlæktɪk)
 
adj
of, relating to, or existing between two or more galaxies: the dark clouds of intergalactic space

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
At that speed, it will escape the galaxy's grasp and sail off into
  intergalactic space.
It is so hot that the galaxy's gravity cannot keep it from boiling off into
  intergalactic space.
Even the intergalactic press was on hand to cover the event.
We will roam these planets and treat them as the intergalactic equivalent of
  protected national parks.
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