Proxima Centauri _IS_ a sun.
As the closest star to our sun, Proxima Centauri is in our galaxy.
As of June 2014, the closest known star to the Sun is Proxima Centauri. Proxima Centauri is located 4.24 light-years away from the Sun.
The closest star system to our Sun is Alpha Centauri, which consists of three stars: Alpha Centauri A, Alpha Centauri B, and Proxima Centauri. Proxima Centauri is the closest to the Sun at a distance of about 4.24 light-years.
The nearest star to Earth is Proxima Centauri (Alpha Centauri C).
Proxima Centauri, at about 4 light years, is the closest star after the Sun, followed immediately by the binary stars Alpha Centauri A and B. Proxima Centauri is thought to orbit the Alpha Centauri system in an extremely wide orbit. Theoretically there could be some as-yet-undiscovered small red dwarf or brown dwarf closer to the Sun than Proxima Centauri.
Alpha Centauri
I think that proxima centauri is approximately 4 light years away from the sun. One light year is equal to 5,865,696,000,000 miles. So, 5,865,696,000,000x4 = 23,462,784,000,000 Proxima Centauri is approximately 23,462,748,000,000 miles away from the sun.
Proxima Centauri is about 0.005% as bright as the sun. In other words the sun is about 20,000 times brighter than Proxima Centauri.
Proxima Centauri is 4.243 light years away, or 2,231,648 light minutes.
Proxima Centauri.
Proxima Centauri is 4.2 light years away, so it would take 4.2 years for light from that star to reach us.
The nearest star to the Sun is Proxima Centauri, which is part of the Alpha Centauri star system. It is located about 4.24 light-years away from Earth.