Let's take a look at one of the most intriguing of the 1,739 confirmed exoplanets that is both Earth-sized and in the habitable zone of its star. Known only by its catalog number, Kepler-186f, it has no name yet, but we know quite a bit about it already.
The question become particularly intriguing when we realize that astronomers now estimate that the Milky Way galaxy alone may harbor as many as 4.5 billion Earth-sized planets in the "habitable zones" around their host stars.
We are in the midst of one of the most interesting and challenging science research programs that humans have ever pursued. It is good to keep this in mind when the everyday crises of human affairs seem so overwhelming.
The last few years have been heady for planet hunters. First the hot Jupiters; then the will-o'-the-wisp Glieslings and their cousins; and the results from the Kepler mission, one of which is Kepler-22b.