SETI, aim your scopes at Proxima Centauri...

Scientists are preparing to unveil a new planet in our galactic neighbourhood which is "believed to be Earth-like"

http://phys.org/news/2016-08-scientists-unveil-earth-like-planet.html

Proxima is only 4.2 LY away, but on occasion, its brightness increases. Proxima is what is known as a flare star," meaning that convection processes within the star's body make it prone to random and dramatic changes in brightness.