A given individual may order these contributions slightly differently based on their own personal view of astronomy. The citation index for each paper was normalized by the mean number of citations of all HST related papers from that year and a grand sum of the normalized citation indices per topic was created. That sum then provided the rank ordering for the topics. We note a few particularly interesting demographic points. A number of the other discoveries were spawned from IDT projects, still others came from the general GO pool.
Discovery space is roughly evenly divided between spectroscopy and imaging.
Results include the flattening of the galaxy count slope, the fact that typical sizes of galaxies were smaller in the past, the presence of an increasing fraction of irregular galaxies with increasing z, and a preliminary take on the cosmic star formation history of the universe. Madau et al. High Z Supernovae. Ia at high redshifts and the determination of cosmological parameters. Freedman et al.