Guiding Questions

• What is the source of the Sun’s energy?

• What is the internal structure of the Sun?

• How can astronomers measure the properties of the Sun’s interior?

• How can we be sure that thermonuclear reactions are happening in the Sun’s core?

• Does the Sun have a solid surface?

• Since the Sun is so bright, how is it possible to see its dim outer atmosphere?

• Where does the solar wind come from?

• What are sunspots? Why do they appear dark?

• What is the connection between sunspots and the Sun’s magnetic field?

• What causes eruptions in the Sun’s atmosphere?