X- and Gamma-Ray Astronomy

The IAU Symposium No. 55 on ''X-Ray and Gamma-Ray Astronomy'' has occurred, not entirely by coincidence, at an important moment in the development of these new branches of observational astronomy. In X-ray astronomy the data from the first X-ray observatory UHURU have contributed to a new view of the X-ray sky and a new conception of the nature and properties of galactic and extragalactic X-ray so...