First observational evidence of gamma-ray emission in a proto-planetary nebula
The gamma emission we observe in the sky through our telescopes involves a wide variety of astrophysical objects. That is why the understanding of the physical processes involved in the production of such emission requires the detailed study of objects like pulsar-wind nebulae, supernova remnants, active galactic nuclei, massive young stellar objects, X-ray binaries, and classic- and symbiotic-novae.