During the past decade, the field of astrophysics has progressed at an impressive rate. This was reflected by the topics discussed at the workshop from which this book eminated. These topics include the inflationary universe, the large-scale structure of the universe, the diffuse X-ray background, gravitational lenses, quasars and active galactic nuclei, infrared galaxies, results from infrared astronomical satellites, supernova 1987A, millisecond radio pulsars, quasi-periodic oscillations in the X-ray flux of low-mass X-ray binaries, and gamma-ray bursts.