This is the first comprehensive book on a new and exciting subject - high energy astrophysics. The name of this subject has a double meaning: it refers to the existence of celestial processes in which very large amounts of total energy are explosively released (up to 1060 erg or more), and to processes in which large amounts of energy are transferred to individual particles (up to 1020 eV or more).
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D. W. Sciama (1970) studied this question.