Hello! The distance between the planets in the solar system can vary greatly. Generally speaking, the average distance between planets is about 4.3 billion kilometers. However, this can vary depending on where each planet is in its orbit around the sun. For example, when Mercury and Venus are closest to each other, they are only about 41 million kilometers apart. On the other hand, when Neptune and Uranus are furthest apart, they can be up to 4.7 billion kilometers away from each other. Additionally, some of the dwarf planets in our solar system have orbits that take them much further away from the sun than any of the eight major planets. For example, Eris can be up to 14 billion kilometers away from the sun at its furthest point!