CAPT Anni Potts
But are there? It may be what a great many of us were taught at school, but is this true? The simple answer is no … well, probably no. It's a bit of an ongoing argument and quite a controversial one, too, but the general consensus is no.
- A planet has to orbit the Sun.
- A planet needs enough gravity to pull itself into a sphere.
- A planet needs to have cleared its neighbourhood (or orbit) of other objects. That means it must be gravitationally dominant and that there are no other bodies of a comparable size in its orbit other than its satellites.
However, that's not the end of it because there are hundreds of other known bodies in our solar system that could also be dwarf planets. So in answer to the question, how many planets, dwarf or otherwise, are there in our solar system, the answer is that we don't really know.