Table of contents : OVERVIEW CONTENTS PREFACE 1. THE COSMOLOGICAL PARAMETERS 2. IN THE BEGINNING . . . 3. UNDERSTANDING DATA BETTER WITH BAYESIAN AND GLOBAL STATISTICAL METHODS 4. LARGE-SCALE STRUCTURE IN THE UNIVERSE 5. UNSOLVED PROBLEMS IN GRAVITATIONAL LENSING 6. WHAT CAN B E LEARNED FROM NUMERICAL SIMULATIONS OF COSMOLOGY 7. THE CENTERS OF ELLIPTICAL GALAXIES 8. THE MORPHOLOGICAL EVOLUTION OF GALAXIES 9. QUASARS 10. SOLAR NEUTRINOS: SOLVED AND UNSOLVED PROBLEMS 11. PARTICLE DARK MATTER 12. STARS IN THE MILKY WAY AND OTHER GALAXIES 13. SEARCHING FOR MACHOs WITH MICROLENSING 14. GLOBALLY ASYMMETRIC SUPERNOVA 15. IN AND AROUND NEUTRON STARS 16. ACCRETION FLOWS AROUND BLACK HOLES 17. THE HIGHEST ENERGY COSMIC RAYS 18. TOWARD UNDERSTANDING GAMMA-RAY BURSTS