The sun is not the smallest star in our solar system. It's the only star in our solar system!

Here's why:

* Solar Systems: A solar system is defined by a star being at the center, with planets, moons, asteroids, and other objects orbiting around it.

* The Sun: Our sun is the star at the center of our solar system.

So, while the sun is a relatively small star compared to many others in the universe, it's the biggest and only star in our solar system.