extragalactic

[ek-struh-guh-lak-tik]
adjective
outside the Milky Way system.

Origin:
1850–55; extra- + galactic

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World English Dictionary
extragalactic (ˌɛkstrəɡəˈlæktɪk)
 
adj
occurring or existing beyond the Galaxy

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
What they've seen is that higher-energy gamma rays from an extragalactic flare arrive later than lower-energy ones.
The nail in the coffin were number counts, showing evolution of extragalactic sources.
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