Twin of Earth lived in the neighborhood - a distance of four light-years:
Astronomers have discovered the nearest star system Alpha Centauri Earth exoplanet sufficient. Description of findings published in the journal Nature, a summary of its results in Nature News.
European astronomers have discovered the most Earth-like planets close to another star system. She was found in a group of Alpha Centauri at a distance of a little more than four light-years.