So far, however, the most remote, ancient galaxies they can see have all seemed tiny — much smaller than our own mature galaxy of hundreds of billions of stars. (sciencemag.org)
To determine how and why clusters formed, it is critical to investigate not only mature galaxy clusters as seen in the present Universe but also observe protoclusters, galaxy clusters in the process of forming. (sciencedaily.com)
Instead the Hubble revealed smaller versions of mature galaxies. (discovermagazine.com)