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

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

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

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

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

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

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

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

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