It's not accurate to say the Sun *governs* the motion of all planets in our solar system. It's more accurate to say the Sun's gravity is the dominant force that influences the motion of planets. Here's why:

* Gravity: Every object with mass exerts a gravitational pull on every other object. The Sun, being the most massive object in our solar system, has a very strong gravitational pull.

* Orbital Motion: Planets don't just fly straight through space. Instead, they orbit the Sun in a curved path due to the balance between their forward motion (inertia) and the Sun's gravitational pull.

* Not Total Control: While the Sun's gravity is the strongest influence, it's not the only one. Planets also exert gravitational pull on each other, causing slight variations in their orbits. This is why planetary orbits are not perfect circles, but rather slightly elliptical.

It's a delicate dance of gravity and inertia that keeps everything in our solar system in motion.

Here's a simplified analogy: Imagine a ball on a string being swung around your head. The string represents the Sun's gravity, and the ball's forward motion is like the planet's inertia. The tension in the string keeps the ball from flying off in a straight line, just like the Sun's gravity keeps the planet in its orbit.