Home » Discover The Fascinating World Of Pluto’s Moons

Discover The Fascinating World Of Pluto’s Moons

by spacelover71

Discovering the fascinating world of Pluto’s moons is an exploration of the universe that has captivated the minds of astronomers and space enthusiasts for centuries. As Pluto, the ninth planet in the Solar System, was observed, its moons were first seen through telescopes in the late 1970s and early 1980s.

Since then, the five moons orbiting Pluto – Charon, Styx, Nix, Kerberos and Hydra – have provided invaluable information about the nature of our solar system and the existence of distant planets.


Charon, the largest of the moons, is within a unique double-dwarf planetary system with both objects sharing a common center of gravity. Styx is the smallest of the five moons and is the farthest from the sun. Nix and Kerberos, two similarly-sized moons, are the intermediate moons of the group.

Titled after the underworld river that separated the living from the dead in Greek mythology, Hydra is the outermost of the five moons and has some of the most fascinating features of the group.

Although each of the five moons of Pluto has its own individual characteristics, each has contributed an important piece to the puzzle in our understanding of the solar system. Here, we will explore the fascinating world of Pluto’s moons in more detail and uncover the secrets of the small, icy rock worlds.

Charon is the largest of the moons and is the first to have been officially named in 1978. With a diameter of 1,208 km, it is almost half the size of Pluto and is the largest known satellite compared to its parent planet. Located 19,570 kilometers away from Pluto, the two objects are much closer than most planets and moons in our solar system and thus form a very unique double-dwarf planetary system.

Styx is the smallest of the five moons, with a diameter of only 18 km. It orbits Pluto at a distance of 38,520 km and is the farthest of the five moons from the sun. It was the last of the five moons to be discovered in 2012.

Nix and Kerberos, two similarly-sized moons, are the middle moons of the group. With diameters of 48 km and 25 km respectively, they are much smaller than Charon. Nix orbits Pluto at a distance of 48,660 km, while Kerberos orbits at a distance of 64,800 km. Both were discovered in 2005.

Hydra is the outermost of the five moons and was discovered in 2005. With a diameter of 35 km, it is the second largest of the five moons and orbits Pluto at a distance of 66,530 km. Interestingly, Hydra’s orbit is inclined to the other four moons at an angle of 6.4 degrees, which suggests that it may have been captured from another object in the Kuiper Belt.

Each of the five moons of Pluto has its own unique characteristics and each has contributed an important piece to the puzzle in our understanding of the solar system. With the information gathered from these moons, we are able to gain further insights into the nature of our universe and the mysteries that lie beyond. In the following sections, we will explore the individual moons of Pluto in more detail and learn about the fascinating world of the small, icy rock worlds.



As the largest and most well-known of Pluto’s moons, Charon has been captivating astronomers since its discovery in 1978. Charon orbits the dwarf planet at a distance of 19,640 kilometers from its center, and has a diameter of 1,212 kilometers, nearly half the size of Pluto itself.

Charon completes its revolution around Pluto in 6.387 days, and it is the only natural satellite in the solar system that has an orbital period that matches its primary planet’s rotational period. In addition, Charon is the only moon in the solar system known to have a significant tidal locking effect on its parent planet. This means that the same face of Charon is always facing its parent planet.

Charon is believed to have been formed by the impact of a large body colliding with Pluto early in its history. This catastrophic event is thought to have given it its current shape and is thought to be responsible for the abundance of dark reddish areas on its surface.

It is also believed that Charon is made up of ice, dust, and rock. The dark coloration of its surface is likely caused by ultraviolet radiation, which is absorbed by the substances that make up the moon.

Interestingly, Charon and Pluto have an unusually high albedo, or reflectivity, considering the fact that they are both far from the Sun. This suggests that they contain an abundance of highly reflective substances, such as methane ice.

In addition, its surface is also marked by numerous craters, indicating that it has been subjected to numerous impacts over the course of its lifetime.

Charon has also inspired a wealth of scientific research. In the early 2000s, the Hubble Space Telescope was used to study the composition of Charon’s surface. In 2017, the New Horizons spacecraft made a close flyby of Charon, giving scientists their first close-up view of the moon. This has opened up exciting new possibilities for further research into this mysterious world.

Charon is an extraordinary moon that continues to captivate astronomers. Its unique characteristics make it an intriguing subject of study and its fascinating history continues to be unraveled by scientists. It is a truly remarkable body in the solar system and provides an exciting opportunity for further exploration.



The smallest of Pluto’s moons, Styx is the outermost of the five moons that orbit the dwarf planet. It was discovered in 2012 and is estimated to be two to five kilometers in diameter. Styx is located at a mean distance of 48,000 kilometers from Pluto, and orbits the dwarf planet with a period of 20.2 days.

Styx is believed to be a dark and icy world composed of rock and water ice. Thanks to the New Horizons mission, scientists have been able to learn more about Styx and its surface features.

The most recent images show that the moon is a heavily cratered body, with evidence of ancient impact craters. Several small, light-colored areas are also visible, which could potentially be ice deposits.

Besides its basic size and distance from Pluto, much of what is known about Styx comes from an analysis of its light curve. A light curve is a graph that plots the amount of light received from an object over time. By studying the light curve of Styx, scientists have been able to determine that the moon has a very irregular shape, which means it is likely spinning at an irregular rate. This could mean that Styx is an elongated body, much like its neighbor Kerberos.


Inadvertently, Styx may have been the cause of a massive asteroid impact on Pluto. In 2016, scientists theorized that Styx may have collided with an asteroid, which in turn created an impact crater. This could explain why Pluto has several craters, especially its large heart-shaped feature.

Styx is also one of the most difficult of Pluto’s moons to observe with a telescope. Its small size and great distance from Earth are two of the main reasons for this. As technology continues to advance, however, we may be able to learn more about this mysterious moon and its place in the solar system.

Although it may be small and hard to observe, Styx remains an interesting and important part of the Pluto system. Its discovery has helped us understand more about how the solar system was formed, and it will continue to be studied in the years to come.


Nix and Kerberos

Nix and Kerberos are two of the middle-sized moons of Pluto. Both moons were discovered in 2005 by the Hubble Space Telescope. Nix and Kerberos are found in the same orbit as Charon, the largest of the five moons of Pluto, and are located around 16,500 km away from the planet.

Nix is the larger of the two moons with a mass around 40% that of Kerberos. Nix has an irregular shape, with its longest axis measuring around 70 kilometers. Its surface is dark grey, and scientists believe that it is composed mostly of water ice.

In comparison to Nix, Kerberos is smaller, having a mass of less than 5% that of Pluto’s largest moon, Charon. It also has an irregular shape and a dark grey surface.

Nix and Kerberos both have orbits that are influenced by the gravity of Charon. This phenomenon is known as orbital resonance. As a result, the two moons have a synchronized rotation, with each moon orbiting around the planet twice in the time it takes Charon to orbit once.


Nix and Kerberos also share some similarities in their surface features. Both moons have craters, with the largest crater on Nix measuring around 35 km in diameter and the largest crater on Kerberos measuring around 20 km in diameter.

Scientists have also observed some evidence of tectonic activity on the surface of both moons, which could indicate the presence of subsurface liquid water.

Nix and Kerberos were some of the first moons of Pluto to be discovered and are part of the fascinating world of Pluto’s moons. They have each provided us with unique insights into the makeup and evolution of the Pluto system.



Hydra is the farthest and smallest of Pluto’s five moons. It was discovered in 2005 at the Palomar Observatory in California. Measuring just 32 kilometers (20 miles) in diameter, Hydra is the tiniest of the five moons and is about the size of a small town.

Despite its small size, Hydra is still a fascinating celestial body to explore. It orbits Pluto in a prograde orbit, meaning it orbits in the same direction as Pluto’s rotation. Its distance from Pluto is around 64,750 kilometers (40,220 miles) and it takes 39.2 days to complete one orbit.

Hydra is also incredibly dark, reflecting only about 6% of the sunlight that reaches its surface. This makes it one of the darkest bodies in the solar system. It is theorized that its low visibility is due to the presence of methane ice on its surface.

One of the more interesting features of Hydra is its unique rotation. Hydra is very close to a state of tidal locking, where its rotation and orbital period are in sync. This means that one side of the moon is constantly facing Pluto and the other side is constantly facing away from Pluto.

This creates interesting tidal effects on the surface of Hydra, which can be seen in images taken from the Hubble Space Telescope.

Hydra’s greatest impact on our understanding of the solar system is its role in helping us understand the age of the Pluto system. Scientists have determined that the impacts on Hydra’s surface, as well as the depletion of methane on its surface, are evidence that the Pluto system is actually much older than we once thought.

Hydra is an amazing celestial body and one of the most interesting features of the Pluto system. Its small size and distance from Pluto make it difficult to study, but its effects on our understanding of the solar system are invaluable.

For anyone interested in exploring the fascinating world of Pluto’s moons, Hydra is a great place to start.



Discovering Pluto’s moons has been an incredible journey for scientists and astronomy enthusiasts alike. By uncovering the secrets of these small bodies of rock, we have been able to gain important insights into the physical nature of our solar system.

The discovery of Pluto’s five known moons – Charon, Styx, Nix, Kerberos, and Hydra – has enabled us to gain a better understanding of not only Pluto but of all the other small bodies in our solar system. Charon, the largest moon, is the most well-known.

It orbits Pluto from a distance of 12,000 kilometers and is almost half the size of Pluto itself. Styx is the smallest moon, located almost three times the distance of Charon. Nix and Kerberos, the two middle-sized moons, orbit Pluto at distances of about 48,000 and 58,000 kilometers, respectively.

Lastly, Hydra is the outermost moon, located almost four times farther away from Pluto than Charon.

It is clear from the fascinating world of Pluto’s moons that our knowledge of our solar system is constantly expanding. We are learning more and more about the mysterious bodies orbiting other planets, and their unique characteristics.

This understanding gives us a better perspective on the formation and evolution of our own planet.

We have only scratched the surface of what we understand about Pluto’s moons. There are still many unanswered questions and a wealth of knowledge waiting to be discovered. So, if you have a thirst for knowledge and an eye for exploration, why not head out into the fascinating world of Pluto’s moons today and see what you can uncover?

Who knows, you may just uncover some of the biggest secrets our solar system has to offer!

You may also like