The Cosmic Microwave Background Radiation is one of the most important tools in astronomy, confirming the Big Bang and many other fundamental aspects of the early Universe. According to a new paper, however, we might not be seeing a clear view of the CMB. Instead, the first galaxies in the Universe might have emitted radiation that contributes to the CMB and could explain 1.4% of its light—maybe even more. This could have consequences for the standard model of cosmology.