Here's why:

* Gravity: The sun's immense gravity pulls on all objects in the solar system, including asteroids.

* Orbit: This gravitational pull causes asteroids to follow a curved path around the sun, which we call an orbit.

* Asteroid Belt: Most asteroids reside in the asteroid belt, located between Mars and Jupiter. This belt is full of rocky debris left over from the formation of the solar system.

So, while they may not be as big or as prominent as planets, asteroids are still members of our solar system and orbit the sun just like everything else.