sentences:  On 30 July 2015, Astronomy & Astrophysics said they found a planetary system with three super-Earths orbiting a bright, dwarf star.The four-planet system, dubbed HD 219134, had been found 21 light years from Earth in the M-shaped northern hemisphere of constellation Cassiopeia, but it is not in the habitable zone of its star.The planet with the shortest orbit is HD 219134 b, and is Earth's closest known rocky, and transiting, exoplanet.