1. When do scientists believe our solar system formed?

2. List the nine planets in order from the sun.

3. What is a planetary day?  A planetary year?

4. How many Earths would fit into the sun?

5. What caused the craters on Mercury?

6. What is the atmosphere of Venus made of?

7. What is unique about the Earth in our solar system?

8. How tall is Mount Olympus on Mars?  How does it compare with mountains on Earth?

9. What could the asteroid belt be?

10. What is Jupiter’s red spot?

11. How many rings does Saturn have and how far do they extend?

12. How many moons does Uranus have?

13. Why does Neptune appear blue-green?

14. Who discovered Pluto?  When was it discovered?

15. What are comets made of?  Where are most comets in our solar system located?

16. Which member of our solar system interests you the most?  Why?

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