This work is the third edition of the classic text ""Introduction to Concepts and Theories in Physical Science"". It has been reworked to further clarify the physics concepts and to incorporate physical advances and research. The book shows the unifying power of science by bringing in connections to chemistry, astronomy and geoscience. In short, the aim of this edition is to teach good physics while presenting physical science as a human adventure that has become a major force in our civilization. New chapters discuss theories of the origin of the solar system and the expanding universe - fission, fusion, and the Big Bang-Steady State Conservatory, and thematic elements and styles in scientific thought.