 The galaxy cluster appears to be undergoing the transformation from a galaxy cluster that is still forming, a proto-cluster, to a mature cluster, and it is the first such cluster observed in this stage of its evolution.The cluster consists of seventeen galaxies, and nine of the eleven massive galaxies closest to its centre are starburst galaxies are together forming new stars at the rate of about 3,400 Suns per year.In contrast, the Milky Way produces only the equivalent of one Sun per year, so these galaxies at the core of the cluster are producing stars at a rate three thousand times greater than the Milky Way on average.