Hélène Courtois is a French astrophysicist specializing in cosmography. A graduate of the University of Grenoble, she is a professor at the University of Lyon, where she is currently vice-president, and leads a research team at the Institut de Physique des Deux Infinis in Lyon. After studying the expansion of the universe, she focused on large galactic structures and, in 2014, she and her colleagues identified the supercluster to which the Milky Way belongs, named Laniakea. She is a member of the Institut Universitaire de France and has received the Legion of Honor and the Order of Academic Palms. In 2017, Vanity Fair magazine named her one of the 50 most influential French personalities in the world; in 2018, she won the Prix Eurêka Rive Nord for her commitment to teaching and scientific outreach. Journey through the Seas of the Cosmos, his first work translated into Spanish, won the Ciel & Espace magazine award for best astronomy book for the general public.