Worksheet Chapter 11: Stars and Galaxies in the Universe

1. Describe the main characteristics of the Milky Way galaxy, including its shape, estimated star count, and the location of our Solar System within it.

2. Which nuclear reaction powers a star during its main sequence life stage?

3. True or False: Our Sun will eventually explode as a high-energy supernova at the end of its life cycle.

4. Name the three main structural classifications of galaxies found in the universe.

5. Define the term 'Light Year' (ly) and state why astronomers use light years instead of kilometers to measure distances in outer space.

6. Fill in the blank: The vast cloud of hydrogen gas and cosmic dust where new stars are born is called a ________.

7. True or False: Red stars have a higher surface temperature than blue stars.

8. Explain the difference in end-stage remnants between a large massive star and a supermassive star after undergoing a supernova explosion.

9. State the three factors that determine how bright a star appears from Earth.

10. Outline the life cycle stage sequence of a medium-sized star starting from a nebula to its final death stage.