Mars swung between humid and arid conditions before it dried up

Mount Sharp on the Martian surface

NASA/JPL-Caltech/MSSS/CNES/CNRS/LANL/IRAP/IAS/LPGN

Ancient Mars fluctuated between arid and humid periods, before taking on its current dry state.

This conclusion comes from the study of high-resolution images captured by a telescope on the Curiosity rover, which landed on Mars in 2012. The images reveal details of the geology of Mount Sharp, a 6-kilometre-high mountain at the centre of Gale crater.

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