First the rocky planets, very close to their star, then the gas giants: this is the order in which scientists have hitherto conceived of the hierarchy of planets. A conception that corresponds to our Solar System but also to most of the planetary systems identified to date. However, the recent discovery of a new planet around the star LHS 1903 by the CHEOPS space telescope is now challenging this theory. The international team of astronomers behind the discovery includes scientists from the University of Bern and the University of Geneva who are also members of the National Centre of Competence in Research PlanetS.