1. Chapter 27.1 Characteristics of stars

2. Our Sun

3. Our Star The Sun is a self-luminous ball of gas held together by its own gravity and powered by thermonuclear fusion in its core. Our Sun is a typical star among the various stars in the galaxy, average in mass, size and temperature. It has a radius of 109 Earths and a mass of 330000 Earths.

4. A balance of forces

5. A balance of energy

6. The Spectrum

8. How to Make a Rainbow

9. The Types of Spectra

10. The Spectra of the Sun

11. What is the difference between heat and temperature? Heat & Temperature Heat vs. Temperature

12. How does emitted light change as an object gets hotter?

13. The simplest and most common elements in the universe.

14. What color are you?