Describes the origin of the science of cosmology and the competing theories to explain the beginning of the universe. The big bang theory for the creation of the universe is contrasted with the steady state theory. The author details discoveries that led to the demise of the steady state theory. (PR)

Presents an historical perspective of astronomy. Discusses how Columbus' discovery of America demonstrated the incompleteness of the ancient knowledge of the world and paved the way for unorthodox astronomical ideas, including the sun-centered cosmology of Copernicus. (MCO)

In arguing that the earth circles the sun, Galileo adopted a mode of reasoning that led not only to his prosecution by the church but also to the scientific methodology of hypothesis testing. (Author/JN)

Describes the very-long-baseline array (VLBA) system of radio telescopes that will be completed in the early 1990s. Explains how the VLBA system works and the advantages over present technology. Compares associated international telescopes and very-long-baseline interferometers (VLBI). Illustrates applications for the VLBA and VLBI. (CW)