Lexi Webster
Pluto, the dwarf planet, has long been a subject of fascination for astronomers and space enthusiasts alike. Its size has been a topic of particular interest, with many comparing it to that of Earth's moon or other planetary bodies. One such comparison is with Australia, a large country on Earth. So, is Pluto as big as Australia? Let's delve into the details and find out.
| Characteristics | Values |
|---|---|
| Surface Area | Pluto: 16.65 million km² < Australia: 7.692 million km² |
| Diameter | Pluto: 2,372 km < Australia: ~4,000 km |
| Circumference | Pluto: 7,452 km < Australia: ~25,000 km |
| Conclusion | Pluto is indeed significantly smaller than Australia. |
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What You'll Learn
Pluto is smaller than Australia
The size of Pluto has been a topic of debate and uncertainty. It was only when NASA's New Horizons spacecraft captured images of the dwarf planet that its size could be more accurately determined. These images revealed that Pluto is even smaller than previously estimated.
Pluto's small size was one of the reasons it was reclassified from a planet to a dwarf planet. In addition to its size, Pluto does not meet the criteria of having a strong enough gravitational field to clear its orbit of asteroids.
While Pluto is smaller than Australia, it is not the smallest celestial body in our solar system. Earth's moon is larger than Pluto, as are several of the moons of Jupiter and Saturn. In fact, some of these moons are even larger than the planet Mercury.
Despite its small size, Pluto continues to fascinate scientists and the public alike. The New Horizons spacecraft, for example, has provided valuable insights into the dwarf planet's characteristics, such as the presence of water ice and mountains reaching 11,000 feet (3,350 meters).
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Pluto's moon is bigger than Pluto
Pluto is smaller than Australia. Australia is about 4,000 km wide, while Pluto is only 2,370 km across.
Pluto's moon, Charon, is indeed bigger than Pluto. Charon has a diameter of 1,212 kilometres (753 mi) and is just over half the size of Pluto. It is the twelfth-largest natural satellite in the Solar System. Charon is so big that it causes Pluto to wobble quite a lot, and the two are effectively in a binary system. They orbit each other every 6.387 days and are tidally locked, meaning each keeps the same face towards the other.
Charon is massive enough to have collapsed into a spheroid under its own gravitation. Its gravitational influence is such that the barycenter of the Plutonian system lies outside Pluto. The mass ratio of Charon to Pluto is 0.1218:1, and Charon is slightly less dense than Pluto, suggesting a composition of 55% rock to 45% ice.
Charon's proximity to Pluto means that it appears eight times the diameter of the Moon as viewed from Earth, or 64 times the area. This is due to Charon's proximity to Pluto, rather than its size. The Sun, by comparison, appears much smaller from the surface of Pluto.
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Earth's moon is larger than Pluto
Pluto's moon, Charon, is about half the size of Pluto itself, making it the largest satellite relative to the planet it orbits in our solar system. Charon orbits Pluto at a distance of just 12,200 miles (19,640 kilometers), while our Moon is 20 times farther away from Earth.
Pluto has a diameter of 2,370 km, while Earth's moon has a diameter of 3,470 km. Pluto's mass is about one-sixth that of Earth's Moon.
The debate about the size of Pluto compared to Australia sparked a discussion on Reddit. Some users pointed out that Australia is about 4,000 km wide, making it almost twice the size of Pluto. This means that Pluto is smaller than Australia.
Pluto's size is one of the reasons why it is no longer classified as a planet. If it had more mass, it would have had enough gravity to clear its neighborhood and fit the definition of a planet.
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Pluto is no longer a planet
Pluto is no longer considered a planet due to its size, shape, orbit, and the discovery of many other similar bodies. In 2006, the International Astronomical Union (IAU) redefined the term "planet," and Pluto no longer met the criteria. The new definition requires a planet to orbit the Sun, have sufficient mass to form a spherical shape under its gravity, and clear the space around its orbit of other objects. Pluto failed to meet the third criterion, as it orbits among other icy bodies in the Kuiper Belt.
The debate around Pluto's planetary status began soon after its discovery in 1930. Despite being named Planet X, doubts arose due to its faint appearance and small size, which seemed insufficient to influence the orbits of Uranus and Neptune. In the following decades, astronomers struggled to observe Pluto, and its exact size remained uncertain.
In 2015, NASA's New Horizons spacecraft provided the first close-up images of Pluto, revealing it to be smaller than previously estimated. These images confirmed that Pluto is significantly smaller than Australia, with a diameter of approximately 2,370 km compared to Australia's width of about 4,000 km.
The reclassification of Pluto as a dwarf planet has sparked mixed reactions. Some argue for sentimental reasons, as Pluto has historically been considered a planet. Others point out inconsistencies, noting that Earth and Jupiter haven't cleared their orbits either. However, many astronomers agree with the reclassification, emphasizing the discovery of numerous similar objects in the Kuiper Belt.
Pluto, despite its demotion, remains a fascinating object in our solar system. It has an atmosphere, mountains of water ice, fields of frozen nitrogen, methane snow-capped peaks, and even dunes and volcanoes. Its complex geology and unique features, such as blue skies and red "snow," provide valuable insights into the early solar system.
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Australia is about 4,000 km wide
The size of Pluto has long been a subject of debate, with its demotion from planet status due to its size being a key point of discussion. It is considered a dwarf planet, much like Australia is considered a dwarf continent.
The comparison between the sizes of Australia and Pluto sparked a lot of interest and some humorous discussions. One Reddit user, for example, contemplated the hypothetical scenario of placing Pluto onto Australia and whether this would result in a giant mountain or a volatile destruction that would spread matter across the Earth.
Another interesting comparison is that of Australia's size to that of Pluto's moon. Pluto's moon is quite large, causing Pluto to wobble significantly. This led to a discussion on Reddit about the number of Australias it would take to cover Pluto, with estimates ranging from two to five.
In terms of surface area, Pluto is closer in size to Russia, which has a surface area of 17.1 million km², compared to Pluto's 17.7 million km². Australia, on the other hand, has a surface area of 7.692 million km², reinforcing the fact that it is indeed larger than Pluto in terms of width.
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Frequently asked questions
No, Australia is bigger than Pluto. Australia is about 4,000 km wide, while Pluto is only 2,370 km across.
Pluto was demoted because it does not have enough mass to clear its orbit. Its size was not the main reason for its demotion, but it is smaller than many moons.
Pluto has a surface area of 17,700,000 km², while Australia has a surface area of 7.692 million km².
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