Horizons: Exploring the Universe is an astronomy textbook that was written by Michael A. Seeds and Dana E. Backman. It is in its 14th edition (as of 2019^[update]), and is used in some colleges as a guide book for introductory astronomy classes. It covers all major ideas in astronomy, from the apparent magnitude scale, to the Cosmic Microwave Background Radiation, to gamma ray bursts.

Horizons: Exploring the Universe

Hypernovae, Gamma Rays and Black Holes
Author	Michael A. Seeds
Original title	Ice Volcanoes on a Frozen Moon
Cover artist	Irene Morris (designer) Precision Graphics: Enceladus (large background image): By artist David Seal, NASA. Pluto: Artist's concept of Kuiper Belt Object 2003 UB313: NASA, ESA, and A. Schaller (for STScI). Hypernovae: Colliding binary neutron stars: NASA/D. Berry. First Galaxies: Milky Way: © Myron Jay Dorf/Corbis
Country	United States
Language	English
Subject	Astronomy
Genre	Non-fiction, textbook
Publisher	Brooks Cole/ Cengage Learning
Publication date	1993
Media type	Print (Paperback)
Pages	516
ISBN	0-495-11963-6
OCLC	226106230