Supernova explosions, 511 keV photons, gamma ray bursts and mirror   matter
  There are three astroparticle physics puzzles which fire the imagination: the origin of the ``Great Positron Producer'' in the galactic bulge, the nature of the gamma-ray bursts central engine and the mechanism of supernova explosions. We show that the mirror matter model has the potential to solve all three of these puzzles in one beautifully simple strike. 
R. Foot and Z. K. Silagadze