There are three criteria according to the International Astronomical Union (IAU) to be classified as a full-sized planet in our system:
- It is in orbit around the Sun.
- It has sufficient mass to assume hydrostatic equilibrium (a nearly round shape).
- It has “cleared the neighborhood” around its orbit.
Pluto satisfied the first two, but has not cleared its neighboring region of other objects, therefore it is not a planet.
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence