First Earth-Size Planet Is Discovered in Another Star's Habitable Zone (2 of 2) (image) Penn State Share Print E-Mail Caption This artist's concept depicts Kepler-186f, the first validated Earth-size planet to orbit a distant star in the habitable zone where liquid water might pool on the planet's surface. The discovery of Kepler-186f confirms that Earth-size planets exist in the habitable zones of other stars and signals a significant step closer to finding a world similar to Earth. This image of Kepler-186f is the result of scientists and artists collaborating to imagine the appearance of these distant worlds. Credit NASA Ames/SETI Institute/JPL-Caltech Usage Restrictions The image caption must be published along with the image. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.