Globular clusters are spherical, densely packed groups of stars found around galaxies. They are thought to have formed at the same time as their host galaxy and thus provide a powerful probe for understanding galaxy evolution, as well as being studied as objects of interest in their own right. This volume presents invited articles reviewing our

We report the result of the HST snapshot survey of BL Lac host galaxies. Almost 100 sources with redshift ranging from 0.05 to 1.2 were observed. Virtually all source at z

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The excitation of p-modes seems to be produced by turbulence in the convection zone (see, e.g., Kumar, 1997 and the references therein). Low-degree p-mode allowed a study of the energy distribution of the p-mode oscillations, concluding that it is of Boltzmann type (Elsworth et al., 1995; Chaplin et al., 1997). Moreover, these authors suggest that

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I report on a critical analysis of the scenario of electroweak baryogenesis mediated by nonsuperconducting cosmic strings. This mechanism relies upon electroweak symmetry restoration in a region around cosmic strings, where sphalerons would be unsuppressed. I discuss the various problems this scenario has to face, presenting a careful computation