Overview

• UNAM announced Fierro’s death on September 19; media and officials reported no cause of death had been disclosed.
• Fierro was a longtime researcher at UNAM’s Instituto de Astronomía and a professor in the Faculty of Sciences, later leading the university’s science outreach and the Universum museum.
• Her scientific work focused on interstellar matter and the Solar System, and she belonged to Mexico’s Sistema Nacional de Investigadores at Level III.
• She authored more than 40 books, appeared on radio and television, and earned honors including UNESCO’s Kalinga Prize, the Mario Molina medal, Klumpke‑Roberts and Primo Rovis awards, multiple doctorados honoris causa and honorary membership in the American Academy of Arts and Sciences.
• Condolences poured in from UNAM, the Instituto de Astronomía and the Academia Mexicana de la Lengua, with President Claudia Sheinbaum and Mexico City’s Clara Brugada praising her influence; coverage noted recent public appearances such as Quién 50 and Hay Festival Querétaro.