An international team led by researchers in Japan and Europe has discovered a new multi-planet system around a sun-like star, including an ultra-short period planet with one of the highest densities ever measured. The findings, published in Scientific Reports on 8 November, shed new light on the formation and evolution of planets in extreme environments. An international team led by researchers in Japan and Europe has discovered a new multi-planet system around a sun-like star, including an ultra-short period planet with one of the highest densities ever measured. The findings, published in Scientific Reports on 8 November, shed new light on the formation and evolution of planets in extreme environments. Planetary Sciences Phys.org – latest science and technology news stories