The Size of a Collapsed Star, the Original Scientific View of Neutron Stars During the Mid 20th Century, Scientists Discovering Neutron Stars Which Pulse Virtually Constantly, the Reason Neutron Stars Pulse, the Most Accurate Clocks Within the Universe, the Scientific Discipline Which Developed Because of Pulsar Stars, the Original Hypothesis of Scientists Post Discovering Neutron Stars Which Pulse, the Closest Pulsar to Earth, the Person Who Theorized and Mathematically Proved Neutron Stars During the 1930’s, the Primary Composition of Matter, the Primary Composition of Neutron Stars, the View of Black Holes by Scientists Until the Mid 20th Century, the Reason Scientists Viewed Black Holes as Virtually Impossible to Exist, the Reason the Majority of Scientists Did Not Believe Black Holes Were Possible Until the Mid 20th Century, German Theoretical Physicist Albert Einstein’s View of Black Holes, and the Concept of the “Event Horizon”