How many planets are outside our Solar System?   Artist's impression of exoplanets around other stars Hot Jupiters     Jupiter analogues     This illustration shows a newly discovered Jupiter-like planet and its hypothetical moon (the blue orb) circling the star 55 Cancri. A previously known large planet is just to the left of the star and a hypothetical Earth-like planet to the right of the star. Release date: 14 November 2006