The last two decades of collecting evidence to support the plate tectonic theory is reviewed. Discussion also involves how other terrestrial plants show evidence of once having been hot but with long-term stability and no continuing convection. (Author/SA)

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)

This article focuses on discoveries in astronomy during the past 20 years using a wide range of observing techniques. The future is seen as a time when astronomers will learn more about the distribution of mass in the universe, the physics of energetic sources, and the intricate interconnections of astrophysical processes. (Author/SA)

Reviews major science news stories of 1988 as reported in the pages of Science News. Covers the areas of anthropology, astronomy, behavior, biology, biomedicine, chemistry, earth sciences, environment, food science, mathematics and computers, paleobiology, physics, science and society, space sciences, and technology. (YP)