Imagine you find a brick on your lawn and want to figure out which demolished building it came from. You can't rewind the demolition, but you can analyze the clay composition, match it against known kilns, and narrow the list. That is what NASA scientists did with Teghaza 001 — a chunk of Mars that landed in Earth's Sahara — except the "demolished building" is a crater on another planet and the "kiln records" come from orbiting spectrometers. Teghaza 001 is one of the most ancient Martian meteorites ever found on Earth, old enough to encode chemistry from Mars's early crust. The research team used mineral and chemical signatures locked inside the rock and cross-referenced them against spectral data collected by NASA's Mars Reconnaissance Orbiter (MRO). The base map itself comes from the Mars Orbiter Laser Altimeter (MOLA) aboard the earlier Mars Global Surveyor mission — a topographic dataset that remains the gold standard for Martian elevation. The result is a global map of Mars with 13 white-circled candidate sites, all concentrated in the southern hemisphere highlands. That geographic clustering is not coincidence: Mars's southern highlands are the oldest exposed crust on the planet, and Teghaza 001's ancient composition points there rather than to the younger volcanic plains of the north. Matching orbital spectral signatures to a hand-sample meteorite is a well-established technique in planetary science, but each new meteorite narrows the field's understanding of what Mars's early crust actually looked like. The method's core limitation is that it can never deliver certainty. A meteorite is blasted off Mars by a large impact, drifts through space for potentially millions of years, survives atmospheric entry, and is then found on Earth with no return address. The 13 sites are consistent matches, not confirmed origins. Any site with similar mineralogy that MRO hasn't fully surveyed could also be a candidate. What makes this exercise generative rather than merely archival is the constraint-propagation logic. Every new meteorite with a credible provenance narrows what we know about regional variation in early Martian crust chemistry. If sample-return missions (Mars Sample Return or successors) ever bring back rocks from known locations, those calibration points could retroactively sharpen the provenance estimates for every unanchored meteorite in the collection. The image is catalogued as PIA26802 in NASA's Photojournal, credited to NASA/JPL-Caltech/USGS. No peer-reviewed paper is cited in this release — the map is presented as a data product, not a full methods publication. That matters: without a paper, the community cannot scrutinize the spectral-matching criteria, thresholds, or statistical confidence of the 13 candidate sites. For now, this is a visual summary of ongoing provenance work — useful as a reference map, promising as a method, but incomplete as a scientific argument until the underlying analysis is published and reviewed.
