The Mexican and Spanish-speaking scientific community mourns the passing of Julieta Fierro , one of the most influential voices in popularizing astronomy. The National Autonomous University of Mexico ( UNAM ) confirmed her death at age 77, leaving a tremendous void in science education and communication.
The cause of death has not yet been officially released . Family members indicated that he died peacefully and serenely, while still working on a publishing project, a gesture consistent with his tireless career and his desire to keep curiosity alive in the general public.
Who was Julieta Fierro and her connection to UNAM?
Born in Mexico City in 1948, Fierro trained at the Faculty of Sciences of the National Autonomous University of Mexico (UNAM) , where she studied Physics and earned a master's degree in Astrophysics. From a very early age, she forged a close relationship with the Institute of Astronomy , where she was a senior researcher and a role model for generations of students.
Her institutional commitment led her to become the general director of Science Dissemination at UNAM between 2000 and 2004, a period in which she promoted programs, exhibitions and formats to bring knowledge closer to diverse audiences, always with a close and rigorous language.
The impact of her work transcended borders: she was elected a full member of the Mexican Academy of Language (Seat XXV) and a corresponding member of the Royal Spanish Academy . She also collaborated with international organizations such as the International Astronomical Union and the American Academy of Arts and Sciences.
In the classroom, in auditoriums and in the media, Fierro was a charismatic teacher and communicator, recognized for explaining complex phenomena with everyday examples and powerful metaphors , without losing the pulse of the scientific method.
A life dedicated to spreading science
A prolific author, she published dozens of popular science books aimed at people of all ages, including titles designed for children and works published in native languages, as a demonstration of her commitment to cultural diversity and inclusion.
His influence is also evident in iconic spaces of interactive science: he participated in the creation of the astronomy room at Universum and collaborated on the Descubre Museum in Aguascalientes , in addition to bringing astronomy to radio and television with constant collaborations.
Recognized in Mexico and abroad, she received the UNESCO Kalinga Prize , the Mario Molina Engineer Medal of Merit in Science and several honorary doctorates, among other distinctions from prestigious scientific institutions.
Fierro championed a simple yet powerful idea: that knowledge is a common good. He often reminded people, in clear terms, that the elements that make us who we are were forged in the stars , a way of connecting everyday life with cosmic history.
Ideas and metaphors: from snail to universe
In her inaugural address to the Mexican Academy of Language, she evoked the image of a garden snail to discuss spirals, evolution, and memory. From this seemingly simple image, she linked biology, the history of the universe, and language, building a bridge between disciplines.
He recalled that the raw materials of the cosmos emerged in the first moments, that stars produce elements such as carbon and oxygen , and that explosions of massive stars enrich the environment with heavy elements, essential for rocky worlds like ours.
He emphasized the beauty of spiral shapes in galaxies, sunflowers, and biological structures, and how mathematics allows us to describe them with precision. At the same time, he cautioned that the accelerating expansion of the universe imposes limits on what we can know , reminding us to be humble in the face of the unknown.
Fierro also reflected on the power of language: words can enlighten or confuse. He encouraged using them to propose solutions , care for the environment, and build the future, instead of amplifying grievances. Along these lines, he advocated for an open, empathetic science at the service of society.
Her recent activities maintained that close connection: on June 25, she gave a talk entitled “Mesoamerican Astronomy” at the Museum of Anthropology in Xalapa, an event supported by the University of Veracruz. There, she shared facts and cultural insights—such as the alignment of the Templo Mayor with the Venus setting —and championed the role of girls and women in science, true to her pedagogical spirit.
The announcement of her death, confirmed by UNAM , has generated expressions of affection and recognition from colleagues, institutions, and former students. Those who worked with her highlight her intellectual generosity and her commitment to making curiosity a learning tool for everyone.
What remains is the legacy of a teacher who made astronomy a public conversation: books, museums, lectures, and generations of students who today look at the sky with better-formulated questions. Her work will continue to help us understand the universe and our place within it.