Supernovas may fluoresce
DOI: 10.1063/1.3048267
Philip Morrison and Leo Sartori have presented a theory involving fluorescence of interstellar gas clouds to explain the observed spectra of Type I supernovas. According to their argument [Phys. Rev. Letters, 16, 414 (1966)], most of the supernova light comes from a gas cloud surrounding the exploding center, which is excited by ultraviolet radiation from the explosion.
This article is only available in PDF format