We are not alone. Possibly. Astronomers have discovered seven Earth-sized planets orbiting a star just 40 light-years away. At least three of them could harbour oceans of water, increasing the possibility they could host life. This system has the largest number of Earth-sized planets yet found, making it a key object for future study. Click on the graphic for an expanded view. Continue reading Seven-planet extrasolar system discovered – an annotated infographic