DISCLAIMER: SCIENTISTS ARE NOT SURE YET
On the 7th of March, 2015, signal was discovered, coming from another system, called Gliese. There is another Kepler type planet there (Gliese 581d), where these signals are believed to be coming from.
These signals were received earlier, but were considered as interference.
Interesting thing about this system is that NASA picked this system during the vote in 2008 and 2009 to send “WE ARE HERE” signal.
It is 20ly away, so it is taking 20 years for signal to get here and another 20 for response to fly back, so it’s definitely not a reaction for NASA signal.
This signal, we received on 7th of March is promising as it has its pattern, and it’s coming from non-natural origin.
WE MIGHT NOT BE ALONE!
Search for Gliese 581d signal to get more information