Why NASA's latest discovery of Earth 2.0 is so important in the search for life on other planets

Today, a team of NASA scientists hit a new milestone in the 20-year hunt for a planets outside our solar system by finding a world more like Earth than anything we've ever seen before.  Their momentous discovery points to a planet outside of our solar system about 1,400 light years from Earth. They're calling it Kepler 452b. This amazing find comes with the tantalizing question: Does this planet currently have life or did it at some point in the past? Right now, scientists don't have powerful...