exoplanet

noun

Etymology: Constructed from Ancient Greek: exo- (“outside; extrasolar”) + planet.

1. A planet which exists outside Earth's solar system.

   “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.”

   “In the past two years, NASA’s Kepler Space Telescope has located nearly 3,000 exoplanet candidates ranging from sub-Earth-sized minions to gas giants that dwarf our own Jupiter. Their densities range from that of styrofoam to iron.”