Much attention has been given to Newton's argument for Universal Gravitation in Book III of the "Principia". Newton brings an impressive array of phenomena, along with the three laws of motion, and his rules for reasoning to deduce Universal Gravitation. At the centre of this argument is the famous "moon test". Here it is the empirical evidence…

Presents a concise (3,000 words) history of the universe and includes discussions of the Big Bang and Steady-State theories relative to the expansion of the universe. (PB)

Science communication techniques are expected to change markedly in the next decade because of the developments on an international scale of coupled information systems in various scientific disciplines and technological missions. A change in techniques is also expected because of growing needs of users as well as of producers of science…

Four hundred and ninety one primary journals covered by "Physics Abstracts" in 1965 have been studied and their basic characteristics analyzed in terms of sponsorship, distribution by country, language, frequency, and coverage by secondary services other than "Physics Abstracts," and the number of libraries holding each…

Events leading up to the discovery of the rings of Uranus are described. The methods used and the logic behind the methods are explained. Data collected to prove the existence of the rings are outlined and theories concerning the presence of planetary rings are presented. (AJ)

"The Mystery of Comets" by Dr. Fred Whipple provides an introduction to the modern picture of comets and his personal reminiscences of how his model of comets came to be. An adaptation of several sections of the book is presented. (JN)

Examines the development of American astronomy by discussing: general studies on the subject; early efforts through 1825; establishing foundations (1825-1875); the transitional period (1875-1945); and the space age (1945 to the present). Points out that the field is underdeveloped with a need for additional work. (JN)

A self-instructional unit on advanced astronomy concepts resulted in moderate to high growth in specific target skills for gifted students in grades five through eight. Most of the students expressed heightened interest in astronomy, and one-half elected to pursue advanced investigations in astronomical research. (CL)

"Rings" (by astronomer James Elliot and science writer Richard Kerr) is a nontechnical book about the discovery and exploration of ring systems from the time of Galileo to the era of the Voyager spacecraft. One of this book's chapters is presented. (JN)

This textbook covers astronomy and its connection with geography. Written by the Mathematical Instrument to King George III.

Summarizes methods used in astro-archaeology, and illustrates the type of results that may be obtained with examples from the prehistoric sites of Stonehenge, Eqypt, and Nasca (Peru). (JR)

Outdoor lighting is light pollution which handicaps certain astronomical programs. Protective measures must be adopted by the government to aid observational astronomy without sacrificing legitimate outdoor lighting needs. (PS)