Aside from our own sun, what is the closest star in relation to earth?
Proxima Centauri is 4.2 light years (
Proxima Centauri is nearby to the Binary Star system Alpha Centauri, which consists of two stars Alpha Centauri A and Alpha Centauri B.
It is not yet concluded if or if not Proxima Centauri forms part of this system (to make it a triple star system) due to the fact that the Alpha Centauri binary system is 4.3 light years away from Earth, which in stellar terms is quite close to Proxima Centauri, which is at 4.2 light years away from Earth.
Therefore because Proxima Centauri is 4.2 light years away, which is closer than 4.3 light years away, it is the closest star to Earth, other than our very own star, the Sun.
Hope I helped :)