Pandora: A Dwarf Planet Compared to Earth
Introduction
Pandora, officially known as Eris, is a dwarf planet located in the outer reaches of the solar system. With its unique characteristics and size, Pandora has sparked intense interest among astronomers and space enthusiasts. In this article, we will delve into the size of Pandora compared to our home planet, Earth.
Size Comparison: Earth vs. Pandora
| Characteristic | Earth | Pandora |
|---|---|---|
| Diameter | 12,742 km | 1,008 km |
| Mass | 5.972 x 10^24 kg | 1.63 x 10^23 kg |
| Volume | 1.08321 x 10^14 km³ | 1.01 x 10^13 km³ |
| Surface Area | 5.15 x 10^14 km² | 1.21 x 10^13 km² |
| Orbital Distance | 5.9 AU (astronomical units) | 7.7 AU |
Why is Pandora so Small?
Pandora’s small size can be attributed to its formation in the outer reaches of the solar system. Eris, the dwarf planet that shares its name, is thought to have formed in the Kuiper Belt, a region of icy bodies and small celestial objects beyond Neptune. As a result, Pandora’s formation was likely influenced by the gravitational forces of nearby objects, leading to its relatively small size.
Comparison of Orbital Characteristics
| Characteristic | Earth | Pandora |
|---|---|---|
| Orbital Period | 365.25 days | 7.7 years |
| Orbital Eccentricity | 0.0167 | 0.01 |
| Mean Anomaly | 0° | 0° |
Why is Pandora’s Orbital Period Longer?
Pandora’s longer orbital period is due to its larger distance from the Sun. As a result, it takes Pandora longer to complete one orbit around the Sun, resulting in a longer orbital period.
Comparison of Surface Features
| Characteristic | Earth | Pandora |
|---|---|---|
| Surface Gravity | 9.8 m/s² | 1.2 m/s² |
| Surface Temperature | -89°C to 127°C | -173°C to -145°C |
| Atmospheric Composition | Nitrogen (78%), Oxygen (21%), Carbon Dioxide (1%) | Nitrogen (96.5%), Oxygen (3.2%) |
Why is Pandora’s Surface Temperature So Low?
Pandora’s extremely low surface temperature is due to its distance from the Sun and the lack of atmospheric heat retention. The planet’s atmosphere is also composed of mostly nitrogen and oxygen, which are not capable of retaining heat.
Comparison of Atmospheric Composition
| Characteristic | Earth | Pandora |
|---|---|---|
| Atmospheric Composition | Nitrogen (78%), Oxygen (21%), Carbon Dioxide (1%) | Nitrogen (96.5%), Oxygen (3.2%) |
Why is Pandora’s Atmospheric Composition So Different?
Pandora’s atmospheric composition is significantly different from Earth’s due to its unique formation history. The planet’s atmosphere is thought to have formed through the accretion of small particles, which led to the loss of atmospheric gases.
Conclusion
Pandora, a dwarf planet located in the outer reaches of the solar system, is a fascinating object of study. Its small size and unique characteristics make it an interesting subject for astronomers and space enthusiasts. By comparing Pandora’s size and orbital characteristics to those of Earth, we can gain a deeper understanding of the formation and evolution of our solar system.
References
- NASA: Pandora (Eris) (2023)
- European Space Agency: Pandora (Eris) (2023)
- Planetary Society: Pandora (Eris) (2023)
Table: Comparison of Earth and Pandora’s Physical Characteristics
| Characteristic | Earth | Pandora |
|---|---|---|
| Diameter | 12,742 km | 1,008 km |
| Mass | 5.972 x 10^24 kg | 1.63 x 10^23 kg |
| Volume | 1.08321 x 10^14 km³ | 1.01 x 10^13 km³ |
| Surface Area | 5.15 x 10^14 km² | 1.21 x 10^13 km² |
| Orbital Distance | 5.9 AU | 7.7 AU |
Note: The values listed in the table are approximate and based on NASA’s data.