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Oldest known Mars rock unlocks the planet’s watery past
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Oldest known Mars rock unlocks the planet’s watery past

So, a meteorite found in the Sahara is giving scientists an extraordinary window into ancient Mars. Named Teghaza 001, it is at least 4.1 billion years old, making it the oldest known Martian rock and a piece of the planet’s early crust. Tiny zircon crystals helped researchers date it, while altered minerals show that liquid water once moved through Mars’s ancient crust and mantle. The rock also offers clues that Mars was already losing much of its atmosphere as it cooled - a remarkable record of the planet’s changing past.
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