Alien Worlds, Martian Methane, Looking for Life
Someone's made a 'top 10' list of "top exoplanet discoveries of 2014," including the first potentially habitable Earth-size world. Mars had an ocean: billions of years ago. Scientists are piecing together the story of how Mars became the world it is now: and trying to figure out where Martian methane comes from. Other scientists have discovered another reason to look for life on planets orbiting red dwarf stars: and there's the ongoing discussion of how to define "life." We're learning more about this universe, and discovering that there's much more to learn. More at A Catholic Citizen in America .