Milly way galaxy 18. How are the large and small Magellanic Clouds interacting with our very own Milky Way Galaxy?
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19. How do the stars in the large and small Magellanic Clouds differ from the stars in our Milky Way?
20. What is known to be at the center of most galaxies?
21. What is dark matter? How can we detect it?
22. What is the best evidence for the existence of dark matter?
23. What is dark energy and how does it explain the expansion of the Universe?
24. How does the decrease of gravity among galaxies as they move away from each other cause an increase