Two years after reporting the detection of a subsurface lake of liquid water near Mars’ south pole, scientists say they’ve gathered further evidence for the existence of that lake — plus three more hidden reservoirs of what’s likely to be super-salty H2O.
Such findings raise new hopes in the search for life beyond Earth in the solar system, although the conditions that’d be required are close to the edge of plausibility.
The new findings, published this week in Nature Astronomy, take advantage of techniques that look at the smoothness as well as the brightness of radar reflections. The research team includes many of the same scientists who were behind the earlier study, including lead author Elena Pettinelli of the University of Rome.
Pettinelli and her colleagues of ground-penetrating radar readings from MARSIS, an instrument on the European Space Agency’s Mars Express orbiter.
Two years ago, the team identified a spot in Ultimi Scopuli, an area within a Martian region called Planum Australe, where the brightness of the radar echoes hinted at a reservoir of liquid water that might lie a mile beneath layers of ice and dust. But the researchers had only a limited amount of observations to go on.