Cosmic X-ray astronomy

The results obtained from observations of the celestial x-radiation over the past nine years are reviewed. Emphasis is placed on the study of the discrete sources, particularly those which have been identified with astronomical objects known from optical and radio studies. The isotropic background x-radiation is dealt with briefly, and the theories which account for x-ray production on the astronomical scale are mentioned where applicable. Finally, the observations needed to further advance this exciting subject are discussed.