Located or existing outside our solar system, especially referring to planets around other stars.
From Latin 'extra' (outside) + 'solar' (relating to the sun, from 'sol' meaning sun). A modern astronomical term coined as technology advanced.
For centuries, astronomers wondered if planets existed around other stars—then in 1995 they found the first extrasolar planet, opening our eyes to billions of worlds we'll probably never visit but that might harbor life.
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