Before you purchase, check with your instructor or review your course syllabus to ensure that you . Several versions of Pearson's MyLab & Mastering products exist for each title, including customized versions for individual schools, and registrations are not transferable. In addition, , provided by your instructor, to register for and use Pearson's MyLab & Mastering products. Access codes for Pearson's MyLab & Mastering products may not be included when purchasing or renting from companies other than Pearson; check with the seller before completing your purchase. If you rent or purchase a used book with an access code, the access code may have been redeemed previously and you may have to purchase a new access code. Access codes that are purchased from sellers other than Pearson carry a higher risk of being either the wrong ISBN or a previously redeemed code. Check with the seller prior to purchase. — With trusted authors Eric Chaisson and Steve McMillan communicate their excitement about astronomy, delivering current and thorough science with insightful pedagogy. The text emphasizes critical thinking and visualization, and it focuses on the process of scientific discovery, teaching students “how we know what we know.” The Eighth Edition has been thoroughly updated with the latest astronomical discoveries and theories and improved pedagogical features. 0321897617 / 9780321897619 Astronomy Today Plus MasteringAstronomy with eText — Access Card Package Package consists of: 0321901673 / 9780321901675 Astronomy Today 0321909860 / 9780321909862 MasteringAstronomy with Pearson eText — ValuePack Access Card — for Astronomy Today