The universe’s normal and invisible dark matter is revealed in this portrait assembled from space telescope observations. Normal matter appears in red, its distribution observed primarily by the European Space Agency’s XMM/Newton telescope. The blue regions distinguish areas of invisible and elusive dark matter as recorded by the Hubble Space Telescope. The gray areas denote stars and galaxies, the visible light of which was also observed by Hubble. Credit: NASA, ESA and R. Massey (California Institute of Technology)
