Mysterious ‘supervoid’ 1.8 billion light-years wide, could be the biggest object ever discovered in the universe.
A new study of gamma-ray light from the center of our galaxy, the Milky Way, makes the strongest case to date that some of this emission may arise from dark matter, an unknown substance making up most of the material universe. Gamma-ray map of the galactic center. Image © A. Mellinger, CMU; T. Linden, Univ. of Chicago