SN 1987A is the only supernova visible to the naked eye in the last 400 years and the most studied supernova in history. The event was a core-collapse supernova, meaning the compacted remains at its core formed either a neutron star or a black hole. Evidence for such a compact object has long been sought, and while indirect evidence for the presence of a neutron star has previously been found, this is the first time that the effects of high-energy...