Young star clusters form a string of pearls along a ring-like structure in Arp 107, a pair of colliding galaxies in Leo Minor. This composite contains two Spitzer views. An image taken at a wavelength of 8 microns (red) provides a clear view of the young clusters, while a 3.6-micron image (blue) highlights older stars in the small companion to the northeast and the bridge connecting the pair. The field of view is 3 arcminutes; north is up and east is to the left.
NASA/JPL-Caltech / B. J. Smith, et al.