Ever since the discovery of Pluto in 1930, kids grew up learning about the nine planets of our solar system.
Profiles the New Horizons mission, the first ever spacecraft mission to Pluto, covering the science behind its creation and launch, detailing Pluto's discovery, and examining the findings of the historic mission.
Pluto, formal designation 134340 Pluto, is the second-most-massive known dwarf planet in the Solar System (after Eris) and the tenth-most-massive body observed directly orbiting the Sun. Originally classified as the ninth planet from the Sun, Pluto was recategorized as a dwarf planet and plutoid due to the discovery that it is one of several large bodies within the newly charted Kuiper belt.
Exactly 85 years after Pluto's discovery, the NASA spacecraft set to encounter the icy dwarf planet this summer has spotted small moons orbiting Pluto. The moons, Nix and Hydra, are visible in a series of images taken by the New Horizons spacecraft at distances ranging from about 201 million-186 million km.