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.
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“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:

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