A 4.1-billion-year-old Martian meteorite, Teghaza 001, has been discovered in the Sahara Desert, offering a rare opportunity to study the planet's earliest crust. The meteorite, which weighs a total of 798.5 grams, was found in Mali in 2022 and consists of eight stones, with the largest weighing 442 grams. Researchers from the University of New Mexico, NASA's Jet Propulsion Laboratory, and other institutions have been studying the meteorite, led by Yang Liu. The team's analysis has revealed that the meteorite's minerals retain evidence of ancient magma and interactions with water, providing a unique window into Mars' watery past. The findings, published in the journal Science, suggest that the meteorite may have originated from Mars' southern highlands, but its exact origin remains unknown. The discovery of Teghaza 001 is significant because it provides a rare sample of the Martian crust that is much older than most of the available Martian samples, which come from younger geological settings. The study's lead author, Yang Liu, notes that the meteorite offers new clues to Mars' ancient environment and could help guide future exploration of the Red Planet. While the findings do not establish that early Mars resembled Earth in every important respect, they do provide valuable insights into the planet's deep interior and water-related processes.