Quiz

1. What do we mean by dark matter and dark energy?
2. What is the evidence for dark matter in galaxies?
3. What is the evidence for dark matter in clusters of galaxies?
4. Does dark matter really exist?
5. What might dark matter be made of?
6. What is the role of dark matter in galaxy formation?
7. What are the largest structures in the universe?
8. Will the universe continue expanding forever?
9. Is the expansion of the universe accelerating?
10. Who discovered this acceleration? 

Hint: Check Accelerating Universe in Wikipedia