How many of these questions can you answer correctly?

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1. How many planets are in the Solar System?
2. What is the fifth planet from the Sun?
3. What is an astronomical unit?
4. How many terrestrial planets are in the Solar System?
5. What can be found between Mars and Jupiter?
6. Why was Pluto "demoted" as a planet?
7. What kind of star is the Sun?
8. What is the hottest planet in the Solar System?
9. What is the surface temperature of that planet?
10. Earth is located within the circumstellar habitable zone, which is frequently referred to as what?