Seeds, Michael A. Horizons : exploring the universe / Michael Seeds, Dana Backman. - 12th ed. - Australia ; United States : Brooks/Cole, Cengage Learning, c2012. - xiv,514 p. : col. ill. ; 28 cm. Includes index. ISBN: 9781111430207 1111430209 Subjects--Topical Terms: Astronomy. LC Class. No.: QB45.2 / .S44 2012