Alpha Centauri is not in our solar system. It is a star system - a group of stars bound together by gravity.

Here's the breakdown:

* Our Solar System: Consists of our Sun and all the objects orbiting it, including planets, moons, asteroids, and comets.

* Alpha Centauri: Is a triple star system (three stars) located about 4.37 light-years away from our Sun. It's the closest star system to our own.

So, while Alpha Centauri is our nearest stellar neighbor, it is not part of our solar system.