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...System. For this reason, the discovery of water is the primary goal of many space missions. Despite being 55 million kilometres from Earth, Mars (Figure 1b) can often be spotted with the naked eye in the night sky as a reddish-orange object (Figure 2). It has been observed throughout human history, with the earliest record dating back to ancient Egypt, and for this reason...

...system.” Before this study, however, the data simply wasn’t available to draw this conclusion. Martin’s team worked with Cambridge Econometrics, business management consultants, who are specialists in building up city-level datasets from local data. Now, with funding from the Economic and Social Research Council, the team has increased to include researchers at the...