The closest star from the earth is proxima centauri. It is about 4.2 light year far from the earth.
Proxima Centauri is a red dwarf star with a mass about an eighth (12.5%) of the Sun's mass and average density about 33 times that of the Sun.The habitability of Proxima Centauri b has not been established, but the planet is subject to stellar wind pressures of more than 2,000 times those experienced by Earth from the solar wind