What has nine planets?

Answer 1

Our solar system has 8 major planets and 5 dwarf planets. We used to label our solar system as having 9 major planets and no dwarf planets, but in 2006 the definition of planet was modified, and Pluto was moved to the dwarf planet category.

The 8 major known planets in order from the Sun are:

1. Mercury
   
2. Venus
   
3. Earth
   
4. Mars
   
5. Jupiter
   
6. Saturn
   
7. Uranus
   
8. Neptune
   

If you list ALL 13 known planets in order, including dwarf planets, they are:

1. Mercury
   
2. Venus
   
3. Earth
   
4. Mars
   
5. Ceres
   
6. Jupiter
   
7. Saturn
   
8. Uranus
   
9. Neptune
   
10. Pluto
    
11. Haumea
    
12. Makemake
    
13. Eris
    

Dwarf planets also fall under the category of minor planets, of which there are thousands in our solar system. As of 2017, the orbits of 734,274 minor planets were archived at the Minor Planet Center, 496,815 of which had received permanent numbers. The largest minor planet that is not considered to be a dwarf planet is Sedna.