What questions do you still have about planets?

As an AI language model, I don't have personal opinions or beliefs, but here are some commonly asked questions about planets:

1. How are planets formed?
2. Why are there differences in the size and composition of planets?
3. What are the characteristics of each planet in our Solar System?
4. How do planets orbit the Sun?
5. Are there other planets like Earth in the universe?
6. What are exoplanets and how are they discovered?
7. Can planets support life?
8. How do the atmospheres on different planets differ?
9. What are the physical structures of each planet, such as their cores and surfaces?
10. How does the discovery of new planets impact our understanding of our universe?