Homework 12: Due November 28

1. Read Mystery 4.
2. What is the fundamental observation that makes astronomers think that dark matter exists?
3. Why does MoND (the modification of the idea of gravity) not satisfy scientists as an explanation for dark matter?
4. What was Einstein's biggest 'blunder'?
5. What observations did Hubble make to show that the Universe is expanding? Can you think of another way to interpret his results?