A New Class of Pulsars

Abstract
In 1939, seven years after the discovery of the neutron, nuclear physicists constructed the first models of a “neutron star.” Stable results were found with masses comparable to the Sun's and radii of about 10 km. Binary pulsars, pulsars with millisecond periods and pulsars in globular clusters are distinguished by their evolutionary histories, and are providing tools for fundamental tests of physics.