Gamma-ray image of Fermi bubbles (IMAGE) Universiteit van Amsterdam Caption Gamma-ray image of the Fermi bubbles (blue) overlaid on a map of RR Lyrae stars (red) observed by the GAIA telescope. The shape and orientation of the Sagittarius dwarf (Sgr) match those of the Fermi cocoon perfectly well – a bright substructure of gamma-ray radiation in the southern part of the Fermi bubbles. This is strong evidence that the Fermi cocoon is due to energetic processes occurring in the Sagittarius dwarf galaxy, which from our perspective, is located behind the Fermi bubbles. Credit Image: Crocker, Macias, Mackey, Krumholz, Ando, Horiuchi et al. (2022) Usage Restrictions For use with article License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.