Ancient Sahara Meteorite May Reveal Mars’ Watery Past
WHO:
CNN - Yang Liu, a planetary scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California, was the lead author of a study on the meteorite.
CNN - Hayward Melton, a doctoral student at the California Institute of Technology, coauthored the study and developed a new dating method.
CNN - Matthew Genge, an associate professor of Earth and planetary science at Imperial College London, was not involved in the study.
CNN - Darryl Pitt, a meteorite collector and chair of the meteorite division at the Maine Mineral & Gem Museum in Bethel, Maine, helped broker the museum’s acquisition of the meteorite.
WHAT:
CNN - Teghaza 001 is believed to have formed from mantle-derived magma that later became part of Mars’ outer crust.
CNN - Yang Liu said the sample comes from a Martian crustal area scientists have not sampled before.
CNN - Liu said the meteorite’s surface features suggest it may have spent time in the desert before it was discovered.
CNN - Liu initially nearly declined to study the sample because it was classified as a shergottite; she said shergottites make up almost 90% of known Martian meteorites and are usually less than 600 million years old.
CNN - Liu said she remains interested in resolving questions she could not answer in the study and expects further discoveries from the sample.
Space.com - The rock is described as a “Rosetta Stone” that could unlock the history of water on Mars.
CNN - Teghaza 001 is a rose-colored Martian meteorite composed of eight fragments weighing 798.5 grams (1.76 pounds) total; its largest fragment weighs 442 grams (0.97 pounds).
CNN - The meteorite is a basalt and contains two calcium-rich minerals in proportions not seen in other samples, as well as an unusual relative abundance of oxygen isotopes.
CNN - Zircon dating indicates the rock formed at least 4.1 billion years ago, within roughly the first 400 million years of Mars’ existence.
CNN - Analysis found evidence that water interacted with the ancient Martian crust.
CNN - Researchers identified 13 possible source locations in Mars’ southern highlands.
Space.com - The Sahara-discovered rock formed more than 4.1 billion years ago and may reveal information about Mars’ early crust and its interaction with water.
CNN - The Maine Mineral & Gem Museum acquired Teghaza 001 for an undisclosed amount.
WHERE:
CNN - Researchers compared the meteorite’s mineral and chemical composition with data from NASA’s Viking landers and Curiosity and Perseverance rovers to assess its Martian origin.
CNN - Meteorite hunters found Teghaza 001 on a salt plain in Mali, in West Africa.
CNN - Researchers identified 13 possible origin sites in Mars’ southern highlands.
Space.com - The rock was discovered in the Sahara Desert.
WHEN:
CNN - The meteorite’s zircon crystals indicate an age of at least 4.1 billion years.
CNN - The study was published October 29 in the journal *Science*.
CNN - The meteorite was discovered in 2022.
WHY:
CNN - Liu said the sample could help scientists understand early Mars, Earth, and why Mars became dry while Earth did not, with implications for planetary habitability.
CNN - Genge said the meteorite provides a window into early Mars, when water was expected to be present.
HOW:
CNN - An asteroid or comet impact blasted the rock off Mars; it then orbited the Sun, potentially for several million years, before Earth’s gravity captured it and it entered Earth’s atmosphere.
CNN - Researchers dated zircon crystals and checked the estimate using a laser-based method that vaporizes very small sample regions.
CNN - The laser beam was about one-tenth the diameter of a human hair; the technique reduced dating time from a month to a day and preserved more original material for further study.
(UPDATED November 6, 2026 23:01 UTC)
A newly studied Martian meteorite formed at least 4.1 billion years ago, revealing ancient crust. Its minerals show water interacted with Mars, offering clues to the planet’s early history. Found in Mali’s Sahara, the rock may help explain why Mars became dry.
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(UPDATED November 6, 2026 16:06 UTC)
A Martian meteorite found in Mali formed more than 4.1 billion years ago. Its minerals show ancient water interacted with Mars’ early crust, researchers say. The rare rock could help explain how Mars became dry while Earth remained habitable.