By now, we have discovered hundreds of stars with multiple planets orbiting them scattered throughout the galaxy. Each one is unique, but a system orbiting the star HD 158259, 88 light-years away, is truly special. The star itself is about the same mass and a little larger than the Sun - a minority in our exoplanet hunts. It's orbited by six planets: a super-Earth and five mini-Neptunes... These two bodies are in what is described as a 2:3 orbital resonance. For every two laps Pluto makes around the Sun, Neptune makes three. It's like bars of music being played simultaneously,...