Research report
Worth Revisiting: An ancient Mars rock carries a water record
A pink meteorite from Mali preserves clues to the Red Planet’s early crust.
Briefed November 9, 2026 · Aliens in the Clouds
Worth Revisiting · Research findings
NASA describes research on Teghaza 001, a meteorite found in 2022 and identified as Martian using chemical signatures. Its minerals point to a formation more than 4.1 billion years ago, making it among the oldest known Martian meteorites.
Researchers found evidence that water altered the rock around 4.1 billion years ago. The sample provides information about ancient Martian geology and water; the report does not claim that it contains evidence of life.
Why it matters
A piece of ancient Mars that can be studied on Earth is a direct way to investigate the conditions that existed when the planet was young.
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