The atmosphere on Mars contains up to a hundred times more water than previously suspected, according to a new study that could change our understanding of the Martian climate, and could suggest that more water existed on the surface of the Red Planet in its early history. Using data from the...

Observations over the last decade suggest that methane clouds form briefly over Mars during the summer months. The discovery has left many scientists scratching their heads, since it doesn’t fit into models of the martian atmosphere. “The reports are extraordinary,” says...