Being or originating outside the solar system: an extrasolar planet. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "extrasolar" in a sentence
"Yet until the 1990s, with the discovery of a star that wobbled suggesting it was being orbited by a large object, there was no concrete evidence that any of these so-called extrasolar planets existed."
"His lead character here is Paul Butler, now at the Carnegie Institution of Washington, who has been involved in scores of planet discoveries since the first so-called extrasolar planet was found in 1995."
"That growth in knowledge is illustrated by the work done by Hubble on the distant worlds known as extrasolar planets."