NASA scientists found evidence of flowing water on the surface of Mars. If confirmed, this could be a game-changer. Namely, access to water on mars could make a manned voyage there much more likely. But scientists — and non-scientists — still have many questions. Does this discovery mean humans could live on Mars? Where is the water coming from? The BBC news service from Great Britain answered these questions and others.
Photo of Mars by NASA/JPL-Caltech/University of Arizona