Beginning with a look at astronomy’s history, students will recognize the contributions of Ptolemy, Copernicus, Galileo, and Newton to our understanding of the universe. The second Unit investigates telescopes and detectors such as radio receivers. An examination of the characteristics and processes of the Sun will be followed by a look at the terrestrial planets: Mercury, Venus, and Mars. After studying the Earth-Moon system, students will explore facts about the minor planets, Jupiter, Saturn, and the outer planets. Moving beyond the solar system, students will learn the characteristics of stars, galaxies, and deep space objects.