- New Horizons Pluto-Kuiper Belt Mission@
- Nine Planets: Pluto
 - Find details about Pluto, the dwarf planet, and its moon Charon. - NSSDC Photo Gallery: Pluto
- Offers images of Pluto and its satellite Charon.
- Planet Pluto, The
- Describes the dwarf planet's highly elliptical orbit, surface, interior, and moon, Charon.
- Pluto - National Space Science Data Center
- Directory of resources about the dwarf planet Pluto and its exploration from NASA's Lunar & Planetary Science department.
- Pluto and Charon - The Planetary Society
- Learn about Pluto and Charon, the pair of objects that mark the outer edge of the orderly Solar System, and the inner edge of a vast region of frigid worlds, the Kuiper belt and Oort cloud, home of comets and, possibly, of many more planet-sized bodies.
- Pluto Portal, The
- Offers information about the Pluto-Charon system, the Kuiper Belt, and more.
- SPACE.com: Pluto Might Have Rings
- Article examining the possibility that Pluto is encircled by rings fashioned from debris ejected from the surface of its tiny moons.
- SPACE.com: Pluto's Newest Moons Named Hydra and Nix
- International Astronomical Union officially christened Pluto's two newest satellites Nix and Hydra. Learn the story behind the naming of the two moons and find other recent news about Pluto.
- The Dwarf Planet Pluto - Views of the Solar System
- Learn about dwarf planet named for the Roman god of the underworld. Find facts on Pluto's rotation, geologic structure, moons, and icy surface.
- Tombaugh, Clyde (1906-1997)@
- Discover the adventures of Clyde W. Tombaugh, the American astronomer who discovered the planet Pluto in 1930. Sites offer profile, biography, interview, photographs, and tribute to the astronomer who also discovered asteroids of which one of them is named 1604 Tombaugh.
- Windows to the Universe: Pluto
- Information on Pluto, the large Kuiper Belt object that was once known as the ninth planet. Learn about the dwarf planet's discovery along with facts about its geology, atmosphere, moons, and rings.
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