If standard gravitational theory is correct, then most of the matter in the universe is in an unidentified form which does not emit enough light to have been detected by current instrumentation. This book is the second editon of the lectures given at the 4th Jerusalem Winter School for Theoretical Physics, with new material added. The lectures are devoted to the "missing matter" problem in the universe, the search to understand dark matter. The goal of this volume is to make current research work on unseen matter accessible to students without prior experience in this area and to provide...

If standard gravitational theory is correct, then most of the matter in the universe is in an unidentified form which does not emit enough light to have been detected by current instrumentation. This review volume is the extended editon of the lectures given in the 4th Jerusalem Winter School of Theoretical Physics, with new materials added in. It devoted to the discussion of the so-called "missing matter" problem in the universe - dark matter and dark energy. The goal of this volume is to make current research work on unseen matter accessible to students of faculties without prior experience...