This is because the gravitational influence of the sun weakens with distance. While the planets further out still orbit the sun, the force holding them in place is less strong, allowing them to spread out more.
Here's a simplified way to think about it:
* Inner planets: These planets experience a strong pull from the sun, keeping them in relatively close orbits.
* Outer planets: These planets experience a weaker pull from the sun, so they can orbit further out and have more space between them.
There's a mathematical relationship called Bode's Law that provides a rough approximation of the spacing of planets in our solar system, though it's not perfectly accurate.
