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Mars kept a water diary in stone.

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And the story is stranger than one

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vanished lake.

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A September twenty twenty-six study
examined rocks

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along the inner rim of Jezero Crater.

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Scientists expected layered sediments.
Instead, they found

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rock born from magma, changed by water

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at least three times.

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First, groundwater rich in carbon dioxide
reacted

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with the rock. A second episode may

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have involved the ancient lake.

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Later, heated water moving underground
left another

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mineral record. The team can work out

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the sequence, but not the ages of

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those events.

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That matters because a world can become

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more or less welcoming to life as

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its water changes. These rocks record
changing

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environments. They do not, by themselves,
prove

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that life existed. What would convince
you:

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chemistry, microscopic structures, or
both?