Question

What is the name of the ninth planet in our solar system?

Answer 1

There isn't one.

Explanation:

If Pluto was still a planet, which it no longer is, as it is now classified as a dwarf planet, because it does not clear its orbit, there would be nine planets in the Solar System.

Now that Pluto is no longer a planet, there are only eight planets that meet the criteria of being a planet.