One of them is that the Milky Way is teeming with earth-like planets. But is it possible to determine if there is life there? And in particular are there humans living in those planets?
http://theweek.com/article/index/254523/the-biggest-scientific-breakthroughs-of-2013 http://theweek.com/article/index/254523/the-biggest-scientific-breakthroughs-of-2013
