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A second photo from the Hubble Space Telescope confirms that Pluto has two additional moons, Nix and Hydra.
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Hubble Space Telescope
NASA/ESA space telescope launched in 1990
The Hubble Space Telescope is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned as a vital research tool and as a public relations boon for…Source: Wikipedia (CC BY-SA)
Pluto
Dwarf planet
Pluto is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It is the ninth-largest and tenth-most-massive known object to directly orbit the Sun. It is the largest known trans-Neptunian object by volume by a small margin, but is less massive than…Source: Wikipedia (CC BY-SA)
Nix (moon)
Moon of Pluto
Nix, formal designation (134340) Pluto II, is a natural satellite of Pluto, with a diameter of 49.8 km (30.9 mi) across its longest dimension. It was discovered along with Pluto's outermost moon Hydra on 15 May 2005 by astronomers using the Hubble Space Telescope, and was named…Source: Wikipedia (CC BY-SA)
Hydra (moon)
Moon of Pluto
Hydra, formal designation (134340) Pluto III, is a natural satellite of Pluto, with a diameter of approximately 51 km (32 mi) across its longest dimension. It is the second-largest moon of Pluto, being slightly larger than Nix. Hydra was discovered along with Nix by astronomers…Source: Wikipedia (CC BY-SA)