The paper by Blumenthal, Faber, Primack, and Rees explores the hypothesis that cold dark matter (CDM) is the dominant form of matter in the universe, explaining the formation of galaxies and large-scale structures. CDM is characterized by particles with negligible velocity dispersion and weak interactions, making them nonrelativistic at early times. The authors discuss several candidates for CDM, including axions, photinos, and black holes, and argue that CDM is more plausible than baryonic or warm DM due to observational evidence and theoretical constraints. The paper outlines the growth of density perturbations from the early universe, assuming an initial Zeldovich spectrum of adiabatic fluctuations. These fluctuations evolve into the observed galaxy and cluster distributions, with smaller fluctuations forming galaxies and larger fluctuations forming superclusters. The authors compare their predictions with observed data, showing good agreement, particularly for the Tully-Fisher and Faber-Jackson laws. They also discuss the implications of CDM for the nature of dwarf spheroidal galaxies, globular clusters, and the formation of superclusters and voids. The presence of voids, which are regions almost devoid of bright galaxies, is explained by the suppression of galaxy formation in low-density regions, which is more likely in a low-density CDM universe. The authors conclude that the cold DM hypothesis provides a compelling explanation for the observed properties of galaxies and large-scale structures, with a cosmological density parameter \(\Omega\) consistent with observations.The paper by Blumenthal, Faber, Primack, and Rees explores the hypothesis that cold dark matter (CDM) is the dominant form of matter in the universe, explaining the formation of galaxies and large-scale structures. CDM is characterized by particles with negligible velocity dispersion and weak interactions, making them nonrelativistic at early times. The authors discuss several candidates for CDM, including axions, photinos, and black holes, and argue that CDM is more plausible than baryonic or warm DM due to observational evidence and theoretical constraints. The paper outlines the growth of density perturbations from the early universe, assuming an initial Zeldovich spectrum of adiabatic fluctuations. These fluctuations evolve into the observed galaxy and cluster distributions, with smaller fluctuations forming galaxies and larger fluctuations forming superclusters. The authors compare their predictions with observed data, showing good agreement, particularly for the Tully-Fisher and Faber-Jackson laws. They also discuss the implications of CDM for the nature of dwarf spheroidal galaxies, globular clusters, and the formation of superclusters and voids. The presence of voids, which are regions almost devoid of bright galaxies, is explained by the suppression of galaxy formation in low-density regions, which is more likely in a low-density CDM universe. The authors conclude that the cold DM hypothesis provides a compelling explanation for the observed properties of galaxies and large-scale structures, with a cosmological density parameter \(\Omega\) consistent with observations.