An international team of astrophysicists has discovered the ruins of a planetary system consisting of the cores of two former giant planets orbiting around the remnants of the core of a red giant. An artist's impression of planets KOI 55.01 and KOI 55.02 (S. Charpinet) Analyzing data from NASA’s Kepler spacecraft, a team of astrophysicists led by Stéphane Charpinet of the Institut de Recherche en Astrophysique et Planétologie, France,...