The Universe Interactive E-book* explores how the organization of stars and galaxies comprise a universe and how research scientists use specialized instruments to collect data about stars and galaxies. This Enhanced E-book takes a closer look at our star, the Sun, and then uses this information to study the properties and characteristics of different types of stars. Following this exploration, the life cycle of stars, parallax, galaxies, and the organization of the universe are introduced.

The Force and Motion Interactive E-book* explores the effects of forces on the motion of objects for both a conceptual and real-world understanding, using common, observable examples, like running, billiards, and motion of vehicles. Learn about concepts such as constant motion, acceleration, speed and direction, as well as a discussion of Newton’s Laws of Motion.