The active search for Extraterrestrial Intelligence (SETI) has been ongoing for half a century. To date, no ET signals from stellar systems have ever been detected. Here are popular theories on why our search has come up empty.
![Why Haven't We Found Aliens? #Infographic #Aliens Why Haven't We Found Aliens?](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_saaZBDIEcCUqfQ7cuHGQn1vyD8zaScaElVXdHDEOsCtAIZ8wVkY39DzxY11-vA6vg3U8N4Zyyq1eaIeiC4yE0Gdg=s0-d)
Infographic by: futurism.com
Infographic by: futurism.com