This volume treats various facets of the dark matter problem. Its themes include astronomical data (galaxy rotation curves, dynamics of galaxy clusters, microlensing of stars in the Large Magellanic Cloud), particle physics (nonbaryonic dark matter, neutrinos) and computer simulation of the evolution of large-scale structure in the universe. Solar neutrinos and prospects for their detection through underground experiments are also discussed. The book will provide a useful reference for all those interested in astroparticle physics.