Max Planck Institute for extraterrestrial Physics
http://www.mpe.mpg.de/main.html
A bridge of hot gas is connecting two clusters of galaxies. Composite optical and X-ray image of the cluster pair Abell 222 and Abell 223.
Image Credit: ESA/XMM-Newton/ EPIC/ ESO (J. Dietrich)/ SRON (N. Werner)/ MPE (A. Finoguenov)