Facts101 is your complete guide to Astronomy Today, Volume 2, Stars and Galaxies. In this book, you will learn topics such as Radiation: Information from the Cosmos, Spectroscopy: The Inner Workings of Atoms, Telescopes: The Tools of Astronomy, and The Solar System: An Introduction to Comparative Planetology plus much more. With key features such as key terms, people and places, Facts101 gives you all the information you need to prepare for your next exam. Our practice tests are specific to the textbook and we have designed tools to make the most of your limited study time.