This Chandra image of an X-ray filament and cloud about 40 light years across (blue inset) was made during an observation of a region of the Galactic Center. These X-ray features are associated with large filamentary and shell-like structures that are bright sources of radio waves (red). The X-rays are thought to be produced when energetic electrons from the radio filaments collide with a cloud of cold gas that has a mass one million times the mass of the Sun.