An article published in the journal “Science” reports a study that explains where most of the water that the planet Mars possessed when it was young, when it was in the liquid state on its surface, has gone. A team of researchers led by Shane Stone of the University of Arizona, USA, used data collected by NASA’s MAVEN space probe to track the movements of water in the atmosphere, up to high altitudes, where there are reactions that break it down and produce atomic hydrogen that is dispersed in space. This study highlighted the role of dust storms in water loss.