Light in Einstein's universe

Great astronomical discoveries of recent years are discussed here. In addition, our new understanding of the observable universe is expressed as a cosmological model which considers the universe as a unique mass-energy system. This model has many interesting consequences and offers a physical basis of gravitation, inertia and the source of relativistic effects. This original approach has considerable relevance to our notions of space and time, and to the nature of physical systems in general. Selected Contents: The Observable Universe. The Bases of Modern Cosmology. The Principle of Relativity. Special Relativity as a Cosmological Theory. Gravitation in a Unique Universe. Space, Time and Matter of our Universe. Comments on the Exercises and Problems. List of References. Index