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The University College London Échelle Spectrograph (UCLES), a high-resolution optical spectrograph which has been used to discover many extrasolar planets.
His achievements have included discovering the extrasolar planets Pollux b, Epsilon Eridani b and HD 13189 companion.
As John H. Jenkins has noted, Asimov's novels typically are set either on Earth (Pebble in the Sky, The End of Eternity, The Caves of Steel), or on fictional extrasolar planets (The Currents of Space, The Naked Sun, the Foundation series).
Hunt for Exomoons with Kepler, a program of the Harvard-Smithsonian Center for Astrophysics that aims to search for moons of extrasolar planets