Science
Clay, not water, likely source of subsurface lakes on Mars, study says – The Independent
A type of frozen clay can produce the same kind of radar reflections thought to be evidence of water

A form of clay known as smectite and not water as earlier thought, could be responsible for bright radar reflections from the south pole of Mars, according to new research.
Some scientists point out that there has always been scepticism about the theory…
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