This book discusses various aspects of cosmic ray physics and astrophysics. Also discussed herein are answers to those astrophysical and cosmic ray questions which are essential for understanding of the subject, such as description of the Universe and of some astrophysical objects, a brief history of cosmic ray investigation, the peculiarities of detection of cosmic rays at various energy bands, a list of arrays for an ultra-high-energy-cosmic-ray investigation and GZK-effect.