The Inner Planets
The inner planets are the four planets that are the closest to the sun. They are also hotter, and they orbit the sun faster than the outer planets for the same reason. The reason is that they are closer to the sun. The reason for them being hotter is that the sun's rays can travel less distance, and that keeps them hot. The reason for the faster orbit is they're closer to the sun, and that makes the gravitational pull have more effect. To learn more about them individually keep reading the pages of the website.