Kepler-51 is a 500-million-year-old G-type star hosting four low density planets, according to a new paper published in the Astronomical Journal. This illustration depicts the Kepler-51 planetary system. Image credit: NASA / ESA / L. Hustak, J. Olmsted, D. Player & F. Summers, STScI. Kepler-51 is located approximately 2,615 light-years away in the constellation of Cygnus. Also known as KOI-620, this star was already known to host three Saturn-sized...
