Article 1 - Motion of Celestial Bodies
Learn why people from ancient times on have been interested in the motions of celestial bodies, how astronomers observed and recorded planetary motion, and read about the theories they developed to explain their observations.

Article 2 - Physical Characteristics of Celestial Bodies
Follow in the footsteps of Aristotle, Copernicus, and nineteenth century astronomers as they try to estimate the size of the sun, moon, and planets, and to understand their composition.

Article 3 - Cosmology: The Structure of the Universe
Find out how astronomers shifted their perspective from a tightly structured world to consider an infinite universe. Also discover the importance of improved instrumentation in the exploration of other galaxies.

The Astronomy Interactive Network is a web site for the 1998 Thinkquest contest created by Rand, Noah and Kim.