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Understanding Pluto's Demotion Quiz

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1. What celestial body classification was Pluto redefined as in 2006?

2. Who was responsible for the reclassification of Pluto from a planet to a dwarf planet?

3. Why was Pluto demoted from a planet to a dwarf planet?

4. In what year was Pluto demoted from being a planet?

5. Which of these statements best explains what it means to 'clear the neighborhood' around its orbit, a key part of the criteria to be a planet?

6. Which region of the Solar System is Pluto located?

7. Before its demotion, how many planets were there in our Solar System?

8. Which of the following celestial bodies is a planet by the current definition but would be demoted if the same criteria used for Pluto's demotion were applied?

9. Which one of these is NOT a characteristic of a dwarf planet?

10. How many dwarf planets are recognized by the IAU in our solar system?