it's more to do with definitions and semantics. a planet was redefined as (among other things) a body that clears a path around its star. pluto's in the middle of the kuiper belt which is chock full of bodies. therefore pluto was demoted to a 'planetoid'.
Science told me that Pluto was a planet.
And then science said it wasn’t a planet. Then we went there and found that it is in fact a planet. Pluto is a planet.
it's more to do with definitions and semantics. a planet was redefined as (among other things) a body that clears a path around its star. pluto's in the middle of the kuiper belt which is chock full of bodies. therefore pluto was demoted to a 'planetoid'.