Newton's Laws of Motion are really important for understanding how planets move in our solar system. Let’s break it down:

1. First Law (Inertia): This law says that an object will keep moving in the same way unless something makes it stop or change direction. So, planets move in almost circular paths around the Sun because of inertia. They keep going at the same speed since there’s not much friction in space to slow them down.

2. Second Law (F=ma): This law is all about how things speed up. Newton figured out that the strength of gravity between two objects depends on their sizes and how far apart they are. When the planets are pulled by the Sun's gravity, their paths bend a little bit, causing them to move in oval-shaped orbits. The force of gravity can be written as $F = G\frac{m_1m_2}{r^2}$. In this formula, $G$ is a constant number, $m_1$ and $m_2$ are the weights of the two objects, and $r$ is how far apart they are.

3. Third Law (Action-Reaction): This law means that for every action, there’s an equal and opposite reaction. When planets pull on the Sun with their gravity, the Sun pulls back just as hard. This back-and-forth action helps keep the planets stable in their orbits around the Sun.

So, by understanding these laws, we can learn a lot about the forces and movements that control our solar system. It shows how physics helps us explain things happening in space.