Galaxy NGC 4921, The Coma Cluster
This Hubble picture is an amalgamation of “50 separate exposures through a yellow filter, totaling about 17 hours of exposure time, plus 30 exposures through a near-infrared filter taken over 10 hours.”
The galaxy, NGC 4921, is unusual because of its light, wispy swirls. These aren’t as distinguished and bright as the spiral arms in most spiral galaxies, which are powered by the active creation of new stars. This weak-limbed galaxy belongs to a class called “anemic spirals,” named for their wimpy arms and weak star formation.
The Coma Cluster, also known as Abell 1656, lies about 320 million light-years away from Earth in the northern constellation of Coma Berenices, the hair of Queen Berenice. More than 1,000 galaxies comprise the cluster. In the image, the ghostly NGC 4921 lies in a field of thousands of galaxies of all shapes, sizes and colors, many of which are much more remote than the cluster and stretch back toward the early universe.