extrasolar

[ek-struh-soh-ler]
adjective
outside, or originating outside, the sun or the solar system.

Origin:
1885–90; extra- + solar1

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World English Dictionary
extrasolar (ˌɛkstrəˈsəʊlə)
 
adj
occurring or existing beyond the earth's solar system

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Dictionary.com's 21st Century Lexicon
Main Entry:  extrasolar
Part of Speech:  adj
Definition:  outside the solar system
Etymology:  exo- + solar
Dictionary.com's 21st Century Lexicon
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Example sentences
Also called an extrasolar planet extrasolar planet: noun: planet outside the
  solar system, orbiting a star other than the sun.
So it came as a total surprise when the first extrasolar planetary systems were
  found, and proved to be completely different.
The group discovered many of the other extrasolar system planets.
Not to mention the rapidly expanding universe of extrasolar planets.
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