* Closest to the Sun: Mercury, Venus, Earth, Mars
* Further from the Sun: Jupiter, Saturn, Uranus, Neptune
This order is a result of how our solar system formed billions of years ago. Here's a simplified explanation:
1. The Sun formed first: A massive cloud of gas and dust collapsed under gravity, forming the Sun at the center.
2. Leftover material: The remaining material in the cloud continued to orbit the Sun.
3. Formation of planets: This material clumped together, with smaller pieces forming larger ones. The closer to the Sun, the hotter the environment. This meant that only rocky material could survive in the inner solar system, forming the inner rocky planets.
4. Outer planets: Further from the Sun, it was cooler, allowing for icy materials to solidify, leading to the formation of the gas giants.
Key point: The planets are not in order by size, mass, or any other property besides distance from the Sun.
