TRAPPIST 1 System
The ultra-cool star TRAPPIST-1, located about 40 light-years from Earth, hosts at least seven exoplanets, most likely rocky worlds the size of Earth and smaller. The star boasts not only the largest number of Earth-like worlds in a single system known to date, but also the most planets that could host liquid water on their surfaces.
This discovery is most important because astronomers discovered a new exo solar system which is not far from us.
Check this video for the info.