 New images from Hubble show D100, a spiral galaxy, being stripped of its gas as it plunges towards the cluster's center. A long, thin stream of gas and dust stretches from the galaxy's core and on into space. The tail, a mixture of dust and hydrogen gas, extends nearly 200,000 light-years. The pencil-like structure is comparatively narrow, only 7,000 light-years wide. Eventually, the galaxy will lose all of its gas. Without the material to create new stars, star formation in the galaxy will cease. The process is called ram pressure stripping. It occurs when a galaxy, due to the pull of gravity, falls towards the dense center of a massive cluster of thousands of galaxies. During its plunge, the galaxy plows through intergalactic material. The material pushes gas and dust from the galaxy. It is estimated that the gas stripping process in D100 began roughly 300 million years ago. Adding to this story is another galaxy in the image that foreshadows D100's fate. The object, named D99, began as a spiral galaxy similar in mass to D100. It underwent the same violent gas loss process as D100 is now undergoing, and it can no longer form new stars.