Sun

The Sun is the star at the center of the Solar System.

Size
The Sun has a diameter of about 1,392,000 kilometres (865,000 mi) (about 109 Earths), and by itself accounts for about 99.86% of the Solar System's mass.

Location within the galaxy
The Sun lies close to the inner rim of the Milky Way Galaxy's Orion Arm.

If one were to observe it from Alpha Centauri, the closest star system, the Sun would appear to be in the constellation Cassiopeia.