27.1 The Sun The Sun is is a giant, hot ball of gas held together by gravity. The Sun is medium-sized compared with other stars in the universe. Approximately 1 million planet…

Learning Targets I can label a diagram of the Sun. The Sun I can describe the solar activity cycle and how the Sun affects Earth. I can compare the different types of spectra…

Astronomy Chapter Eighteen: Earth, the Moon, and the Sun 18.1 The Earth and Its Moon 18.2 Earth Cycles 18.3 The Sun Investigation 18B What causes the seasons? Earthâs Seasons…

Our Star, the Sun Chapter Eighteen The Sunâs energy is generated by thermonuclear reactions in its core The energy released in a nuclear reaction corresponds to a slight…

Objectives Explore the structure of the Sun. The Sun Describe the solar activity cycle and how the Sun affects Earth. Compare the different types of spectra. photosphere…