2020 has been quite a year of surprises, but one thing that has remained constant is the order of the planets in our solar system. The planets, in order from the sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and the dwarf planet, Pluto. Each planet has its own unique characteristics and properties, which makes them all so fascinating to explore. But why are the planets in this particular order? Let's take a closer look and find out.
The Solar System Formation
It all begins with the formation of the solar system. The planets are formed by a process known as accretion, which is when bits of dust and gas from the protoplanetary disk begin to aggregate to form larger and larger bodies. As the bodies become more massive, they begin to attract and capture even more material, eventually forming protoplanets. Eventually, these planets become the planets we know today.
The order in which the planets form has a lot to do with their distance from the sun. As the protoplanets form, they form in order from the sun, with the closest planets forming first. This is because closer to the sun, the material is hotter, and gravity is stronger, allowing the protoplanets to grow more quickly. As a result, the order of the planets from the sun reflects the order in which they were formed.
The Inner Planets
The first four planets in order from the sun are Mercury, Venus, Earth, and Mars. These are known as the inner planets, and they all share some common characteristics. For example, they all have solid surfaces, and they all have relatively low amounts of mass and gravity. This means they have very weak magnetic fields, which give them their own unique properties.
At the same time, the inner planets are all quite different from one another. Mercury has a very thin atmosphere, while Venus has a thick, poisonous one. Earth is the only planet that has liquid water, which helps make it hospitable for life. Mars is the only planet without an active magnetic field, which makes it vulnerable to the harshness of space.
The Outer Planets
The next four planets in order from the sun are Jupiter, Saturn, Uranus and Neptune. These are known as the outer planets, and they all have very different characteristics from the inner planets. They have much more mass and gravity, which gives them much stronger magnetic fields. This means they have different properties than the inner planets.
The outer planets are all gas giants, meaning they are composed mostly of gas and have no solid surface. They also have many moons and rings, which give them unique features. Jupiter is the largest planet, while Saturn has the most moons. Uranus rotates on its side, and Neptune is the coldest planet. All of these differences make the outer planets very interesting to explore.
The Dwarf Planet, Pluto
The ninth and final planet in order from the sun is Pluto. This is a dwarf planet, meaning it is much smaller than the other planets and doesn't fit the criteria for a full-fledged planet. Its orbit is also much more elliptical than the other planets, and it has a very thin atmosphere.
Pluto is fascinating to study, and it has been the subject of many missions and research projects. In 2006, the International Astronomical Union (IAU) officially reclassified Pluto as a dwarf planet. This means that it is now officially the ninth and final planet in order from the sun.
Conclusion
The planets of our solar system are in order from the sun due to the process of accretion. The inner planets, which form closer to the sun, are all solid and have relatively low mass and gravity. The outer planets are all gas giants, have much stronger magnetic fields, and have many moons and rings. The last planet in order from the sun is the dwarf planet, Pluto. All of these planets have unique characteristics that make them so fascinating to explore.
