Following this he delved into the development of gamma ray telescopes and detectors - and then we got to the high point of the night - the objects they are used to study. We were taken on a fascinating journey into a universe of supernova remnants, neutron stars, pulsars and black holes. We were shown glorious images of the Crab Nebula, Eskimo Nebula, and listened to recordings of some of the faster pulsars known to exist. Dr Quinn also described how white dwarf stars can pull material from a nearby giant, eventually causing a huge nova that can release gamma rays. Another source of gamma rays are the extreme active galaxies called quasars and blazars, that eject unfathomable amounts of material and radiation from their cores.