exoplanet

eksoplaneetta puhekieltä A planet which exists outside Earth's solar system.
2007, Alexander Hellemans, "http://www.sciam.com/article.cfm?id=dangling-a-corot Dangling a COROT", (w), vol. 297, no. 3, p. 32:

More such announcements will likely come in the months to follow, as the first space observatory dedicated to hunting exoplanets, called COROT, begins full operation and researchers complete their calculations.