The closest star system to our Solar System is the Alpha Centauri system, located approximately 4.37 light-years (41.3 trillion kilometers) away in the constellation of Centaurus. The system consists of three stars: Alpha Centauri A, Alpha Centauri B, and Proxima Centauri.

1. Alpha Centauri A: This is the brightest star in the system and is very similar to our Sun in terms of mass, size, and temperature. It is a yellow main sequence star, slightly larger and more massive than the Sun.

2. Alpha Centauri B: This is a red dwarf star, much smaller and cooler than the Sun. It orbits Alpha Centauri A with a separation of about 1.3 AU (Astronomical Units).

3. Proxima Centauri: This is the closest star to our Solar System. It is a red dwarf star, even smaller and cooler than Alpha Centauri B. Proxima Centauri is located about 0.24 AU away from Alpha Centauri A and B, making it a triple star system.

Proxima Centauri is of particular interest because it has an Earth-sized exoplanet orbiting it, known as Proxima Centauri b. This exoplanet was discovered in 2016 and is located within the star's habitable zone, which means that it could potentially support liquid water on its surface.