At a media event to discuss the Solar System and the search for signs of alien life, NASA has some real confidence that we will discover signs of life within our lifetime.
“I think we’re going to have strong indications of life beyond Earth within a decade, and I think we’re going to have definitive evidence within 20 to 30 years.” – NASA Chief scientist Ellen Stofan
They also shared a really fascinating and detailed infographic. Click on the graphic to see it full size. Via NASA: