Guiding Questions

• Why do astronomers think that stars evolve?

• What kind of matter exists in the spaces between the stars?

• In what kind of nebulae do new stars form?

• What steps are involved in forming a star like the Sun?

• When a star forms, why does it end up with only a fraction of the available matter?

• What do star clusters tell us about the formation of stars?

• Where in the Galaxy does star formation take place?

• How can the death of one star trigger the birth of many other stars?