Vistas in Astronomy, Volume 3 covers the spectacular and interesting developments in the field of astronomy. This book is organized into two main sections encompassing 18 chapters. The first part deals first with the forces that influence stellar dynamics, followed by intensive discussion on the rediscovery of planet Neptune, the concept of Einstein's light-deflection, and design requirements for large telescopes. This part also presents several astronomical instruments, Auroral investigation techniques, and observations of the Russian satellites. The second part starts with surveys of the developments of a photoelectric technique for determination of radial velocities. This part further examines the emission lines excitation in the spectra of early-type stars, as well as the color, luminosity, and evolution of the stars. Topics on star formation, galactic magnetic field, and aspects of cosmology are also covered. This book is an ideal source for astronomers, and space engineers and researchers.