This is a grant awarded by the National Aeronautics and Space Administration (NASA) Shared Services Center to New York University (NYU) to investigate the physics behind core-collapse supernovae and ultra-relativistic outflows using pulsar wind nebulae. The $310,269.19 grant will fund research to measure the properties of 17 neutron stars and their associated pulsar wind nebulae in order to address fundamental questions about how neutron stars form, how particles are created and accelerated in their magnetospheres, and how this relates to the evolution of star-forming galaxies. The research aims to provide insights applicable to other relativistic outflows like active galactic nuclei and gamma-ray bursts, as well as inform future observations by next-generation observatories. The grant does not have a set-aside designation and is set to be completed by August 21, 2023.