In a public meeting with NASA's chief, the agency's top scientists have said that they expect to find alien life within the next 20 years. Unfortunately, for those hoping that Europa or Mars might harbor life, NASA is fairly confident that the discovery of extraterrestrials will probably be outside our Solar System rather than within it. But still, suffice it to say, the discovery of life of any kind outside of Earth's atmosphere would be massive news. Within 20 years, we could finally find out that we're not alone in the universe -- and, well, that would change everything.