Scaling relations 

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Despite the complexity of galaxy formation and the number of processes that are thought to play important roles, galaxies obey remarkably tight scaling relations. These are correlations between different physical properties that can span, in some cases, several orders of magnitude. The study of these relations and, in particular, their evolution with cosmic time is of great interest and subject of frenetic current investigations. Scaling relations constitute benchmarks for any theoretical model of galaxy formation and evolution.

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