Artist's image (not a telescope photo) of two enormous bubbles of gamma-ray emitting material discovered above and below our Milky Way. They were discovered by NASA's Fermi Gamma Ray observatory and extend about 25,000 light-years from the galactic plane. The bubbles are estimated to give off the energy of 100,000 supernova explosions. Astronomers are not sure what is giving off the gamma rays, but these bubbles could contain millions of tiny Black Holes. The Universe is far stranger than we imagine.