A Changing Cosmos Is the latest edition of the Hands-On Universe astronomy curriculum series. It is the "Best" of the 7 books described below, in a single book.

• Introduction to Image Processing—how to use the HOU Image Processing Software
• Finding Features—including a Browser's Guide to the Universe.
• Measuring Size—Use the pixel plate scale to measure a lunar crater; track Jupiter's moons from night to night; calculate the moons' mass from the mass of Jupiter and the moons' orbital radii.
• Measuring Color—colors of stars, the HR diagram, and how stars evolve according to their mass.
• Measuring Distance—Learn how the cosmological distance ladder is used to determine the distance to far away objects, including how Cepheid Variable stars are used to measure distances to galaxies.
• Measuring Brightness—Learn about photometry -- measurement of light from a celestial object. Calculate stellar magnitudes using logarithms.
• Searching for Supernovae—See how astronomers find supernovae -- exploding stars.