関連ワード:
in which year was pluto considered as a dwarf planet in which year was pluto classified as a dwarf planet in which year was pluto reclassified as a dwarf planet in which year was pluto categorised as a dwarf planet in which year was pluto declared as a dwarf planet in which year was pluto categorized as a dwarf planet in which year pluto was called dwarf planet what year was pluto deemed a dwarf planet when was pluto considered a dwarf planet when did pluto become a dwarf planet and why
