A very exciting discovery was announced today at the Observatoire de Haute-Provence, France. Astronomers have detected a planetary system containing at least five - and maybe seven - planets that orbit a star called HD 10180, which is much like our own Sun. They say this is the "richest" system of exoplanets - planets outside our own Solar System - ever found. Up until now, astronomers had known of fifteen systems with at least three planets, but never one that was this similar to ours in...