Maintaining the rigor and excellence of previous editions, this updated version visits the entire realm of astrophysical research including historical perspective, planets, the solar system, formation of galaxies, interstellar medium, spectra and electromagnetic radiation. New features include ``Improve Your Night Vision'' essays to encourage night sky observing; ``The Unifying View'' which links what has been covered to five core astronomy concepts; student thought questions and a completely redrafted, four-color, computerized art program.