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Pluto has five known moons that we know of so far charon styx nix kerberos and hydra

By Elizabeth Marshall
Published in Universe
February 02, 2024
2 min read
Pluto has five known moons that we know of so far charon styx nix kerberos and hydra

Pluto: The Dwarf Planet with Five Known Moons

Pluto System

Pluto, the dwarf planet located at the edge of our solar system, has fascinated scientists and space enthusiasts alike since its discovery in 1930. Although it was once considered the ninth planet, it was later reclassified as a dwarf planet due to its small size and unusual orbit. Despite its status, Pluto boasts an intriguing system of moons, with five known satellites orbiting around it: Charon, Styx, Nix, Kerberos, and Hydra.

1. Charon: Pluto’s Largest Moon

Charon is Pluto’s largest and closest moon. Discovered in 1978 by James Christy, Charon is so massive that it creates a dynamical relationship with Pluto, causing both objects to orbit a common center of gravity outside of Pluto itself. This unusual characteristic led some scientists to argue that Pluto and Charon form a binary system rather than a planet-moon relationship. Charon’s diameter is approximately half that of Pluto, making it the largest moon relative to its parent body in the solar system.

2. Styx: The River Styx of Greek Mythology

Pluto's Moons

The second moon discovered around Pluto was named after the river Styx from Greek mythology. Styx was first observed in 2012 by the Hubble Space Telescope and is considerably smaller than Charon. Its irregular shape and varying brightness levels have provided scientists with valuable insights into the formation and evolution of Pluto’s moon system.

3. Nix: The Goddess of Darkness and Night

Nix, named after the goddess of darkness and night in Greek mythology, was also discovered in 2005 along with Hydra. It is relatively small in size and orbits Pluto at a greater distance than Charon. Nix’s unique red coloration suggests the presence of organic molecules on its surface, hinting at the intriguing geological processes that shape the moons of Pluto.

4. Kerberos: The Three-Headed Guardian

Kerberos, named after the three-headed dog that guards the entrance to the Underworld in Greek mythology, is the second smallest of Pluto’s moons. It was discovered in 2011 by a team of astronomers using the Hubble Space Telescope. Kerberos’ low reflectivity and dark surface indicate that it likely consists of water ice mixed with other dark compounds.

5. Hydra: The Serpentine Moon

Hydra, the largest and outermost of Pluto’s moons, is named after the nine-headed serpent from Greek mythology. Discovered in 2005, Hydra’s irregular shape suggests a violent past, possibly involving collisions with other objects. Its surface composition remains a mystery, providing scientists with an ongoing puzzle to solve in future exploration missions.

Pluto’s moon system continues to fascinate astronomers and researchers, providing valuable insights into the formation and evolution of the distant dwarf planet. These five known moons, Charon, Styx, Nix, Kerberos, and Hydra, offer a glimpse into the complex dynamics of the Plutonian system. As further research and exploration are undertaken, we can expect to uncover more about these intriguing celestial bodies.

Sources: Nine Planets - Pluto


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Pluto hasn t made a full orbit around the sun since it was discovered in 1930 it will complete its first full orbit on march 23 2178
Elizabeth Marshall

Elizabeth Marshall

Facts explorer

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