The "Black Widow" pulsar is zipping through the galaxy at a speed of almost a million kilometers per hour. A bow shock wave due to this motion is visible to optical telescopes, shown in this image as the greenish crescent.
A Vertical panorama of the Milky Way after twilight. The central bulge of the Milky Way is clearly visible at Sagitarius. The great rift in the middle and the dark coalsack nebula are also visible contrasting against the bright sky.