Presents a chapter from an introductory college-level astronomy textbook in which full-color photographs and numerous diagrams highlight an extensive description of the planet Jupiter. Topics include Jupiter's geology, rotation, magnetic field, atmosphere (including clouds and winds), and the Great Red Spot. (DH)

This article reviews the historical and current observational status of searches for other planetary systems, discusses the nature of the observational problem, and indicates the prospects for success in the future. (DS)