Aliens On Mars And Moons: Neil deGrasse Tyson Thinks We’re Getting Closer

One of the greatest questions of our time is whether we are alone in the universe. And if there is some sort of extraterrestrial life out there, what are those aliens like?
Neil deGrasse Tyson thinks we may have at least a glimpse within the coming decades, because we are likely to find out whether life has ever existed anywhere else in our solar system.