New evidence for liquid water on Mars

Scientists have discovered new evidence that liquid water exists under the ice cap at Mars’ south pole and it could mean the planet is geothermally active.

In 2018, the European Union Mars-Express orbiter discovered that the surface of the ice sheet covering the south pole of March dips and rises, suggesting liquid water may be lurking below. But not all scientists were convinced at the time. Mars is extremely cold, and for subglacial water to exist on the planet in liquid form, there would need to be a heat source, such as geothermal energy. At the time of the discovery of Mars Expresssome scientists therefore thought that the strange radar signal measured by the spacecraft could be explained by something else, for example some kind of dry material under the ice caps.

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