After a year in orbit around Mars, the TGO orbiter of the ExoMars mission (ESA-Roscosmos) reveals a surprising absence of methane and a relationship between dust storms and atmospheric water vapor. The results, published in Nature, were obtained with the ACS and NOMAD instruments. Researchers from the Institute of Astrophysics of Andalusia (IAA-CSIC) participate in the results, as well as in the scientific team that developed NOMAD