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Published online by Cambridge University Press: 15 February 2018
Since almost every facet of astronomy is relevant to the evolution of galaxies, most of the topics discussed at this Colloquium are important to the field. For example, stellar populations and inter-stellar matter in galaxies are to be understood in the context of evolution, and when galaxies are used as probes in cosmological studies it is vital to know how their intrinsic properties vary with time. Some aspects of research on galactic evolution with the Space Telescope are discussed by several authors in the recent ESO/ESA Workshop (Macchetto et al., 1979). In this paper, I concentrate on “lookback” studies that compare present-day and younger galaxies directly. Many of the theoretical ideas mentioned here are quite speculative; the aim is to provide viewpoints from which ST (and related ground-based) studies can be planned, knowing that the real world billions of years ago will surely contain more surprises than verifications of any projections.