An article published in “The Astrophysical Journal” describes the study of a pulsar cataloged as PSR J2215+5135 which is extreme even for this category of objects. A team of researchers from the Universitat Politècnica de Catalunya (UPC) and the Canary Islands Institute of Astrophysics (IAC) used an innovative method to measure the mass of one of the most massive neutron stars discovered, estimated in 2.3 times the Sun’s. This is a method that can also be used with other objects.