This artist's rendering made available by NASA on Thursday, July 23, 2015 shows a comparison between the Earth, left, and the planet Kepler-452b. It is the first near-Earth-size planet orbiting in the habitable zone of a sun-like star, found using data from NASA's Kepler mission. The illustration represents one possible appearance for the exoplanet - scientists do not know whether the it has oceans and continents like Earth.