Alpha Centauri is a few trillion miles from the Sun.
Alpha Centauri A -LRB- α Cen A -RRB- has 1.1 times the mass and 1.519 times the luminosity of the Sun , while Alpha Centauri B -LRB- α Cen B -RRB- is smaller and cooler , at 0.907 times the Sun 's mass and 0.445 times its visual luminosity.
Alpha Centauri -LRB- α Centauri , abbreviated Alpha Cen , α Cen -RRB- is the closest star system to the Solar System , being 4.37 ly from the Sun.
