Astronomy Picture of the Day . The Coma Cluster of Galaxies . ... The Coma Cluster of Galaxies pictured above is one of the densest clusters known - it contains thousands of galaxies . Each of these galaxies houses billions of stars - just as our own Milky%20Way%20Galaxy %20does.Although%20nearby%20when%20compared%20to%20most%20other clusters , light from the Coma Cluster still takes hundreds of millions of years to reach us. ... Publications with keywords: galaxies - cluster of galaxies . ...