Julieta Norma Fierro Gossman is a full-time researcher at the UNAM Institute of Astronomy. She occupies Chair XXV of the Mexican Academy of Language and is a member of the National Network of Researchers at the highest level and is also an honorary member of the American Academy of Arts and Sciences. Julieta Fierro's area of research has been interstellar matter and, most recently, the solar system. Julieta Fierro's most important work is in popular science. She recorded a free-access online course and has written 50 popular books and dozens of varied publications; she also appears regularly on radio and television programmes. She has given hundreds of talks in 39 countries. Over the course of 54 years of activity, Julieta Fierro has received distinctions such as the Science Dissemination Awards from the World Academy, the UNESCO Kalinga Prize, the Klumpke-Roberts Award, the Primo Rovis Gold Medals from the Centre for Theoretical Astrophysics of Trieste, and the Mario Molina Medal. She has been awarded four honorary doctorates. Several laboratories, libraries, planetariums, astronomical societies and five schools, a bookshop and a firefly are named after her.