 The satellite Fermi has discovered dozens of others, demonstrating that the predictions made on the basis of the phenomenology of Geminga were fundamentally correct.Following the publication of the catalog of gamma sources revealed by Fermi, Caraveo coordinated a program centered on the study of unidentified gamma-ray sources.The purpose of the exercise is to find sources with the highest ratio of X-ray to optical emissions, one of the characteristic signs of neutron stars.