The two galaxies have been found to be merging into one and a "chain" of young stellar superclusters are seen winding around the galaxies’ nuclei. The galaxies are surrounded by an egg-shaped blue ring caused by the immense gravity of the cluster bending light from other galaxies beyond it.
Read more: http://sci.esa.int/hubble/54312-merging-galaxies-and-droplets-of-starbirth-heic1414/