Kepler-186f and the Futility of Searching for Earth's Analog

Last month, the Gemini and Keck Observatories confirmed Kepler-186f to be the closest thing we have found to Earth’s twin. This exoplanet — a planet orbiting another star — is in the habitable zone of its solar system, Kepler-186. It is roughly the same size as earth and is just one of 962 confirmed planets discovered by Kepler. There…