Seeds/Backman/Wegryn's ASTRO: EXPLORING THE UNIVERSE, 4th EDITION, helps you understand your place in the universe and how scientists work. Chapter-opening 'Guideposts' and a conversational writing style make the content accessible and help you acquire an understanding of the universe and your place in it, rather than just memorizing basic facts. Online resources let you study where and when you want to help you get the grade you want.