- What did Galileo see that proved to him that the sunspots were not satellites orbiting the Sun, but changes on the surface?
- Galileo made this important discovery by extremely patient and detailed daily observations of the Sun. Explain why this technique is critical to scientific studies, even today.
- Review the evidence that persuaded Galileo that the Sun rotates. Imagine you are Galileo. How would you argue your case?
- At what time or times of the day and at what time intervals do you think Galileo gathered his data on sunspots?
- Why do you think conservatives in Galileo's time wanted to preserve the notion that the Sun was unblemished?
