Since its discovery, Pluto has been the focus of almost continual discussion, investigation, and discovery. A glance back into Pluto's history reveals not only how far astronomy has come, but also how far it still has to go.
Over the previous century, a lot has happened in this frozen globe.
Contrary to earlier beliefs that Pluto was an inactive ice dwarf planet, exploration of the planet revealed astonishing features that had never been observed before in our solar system.