From the bbc.co.uk article:
Skies to be swept for alien life
The switch has been thrown on a telescope specifically designed to seek out alien life.
Funded by Microsoft co-founder Paul Allen, the finished array will have 350 six-metre antennas and will be one of the world’s largest.
The Allen Telescope Array (ATA) will be able to sweep more than one million star systems for radio signals generated by intelligent beings.
Its creators hope it will help spot definite signs of alien life by 2025.