Artists impression of the universe as it might appear if our eyes were sensitive to gamma rays The gamma ray sky is dominated by emmissions from exploding stars and black holes lying within our galaxy and by the energetic cores of distant active galaxies Ordinary middleaged stars like the Sun are almost invisible at gamma ray wavelengths The image shows the band of the Milky Way running from lower left to upper right This is dominated by gamma ray emission from the galactic core lower left which may contain a massive black hole A bright supernova explosion is seen at lower right