Kepler 10b was the first conformed terrestrial extrasolar planet – that is, a planet beyond the Solar System which is made up of rocky materials rather than gases. The planet, however, lies extremely close to its parent star, and as a result it is highly unlikely to harbour any life. Kepler 10b is 3.3 times as massive and 1.5 times the diameter of Earth. The semi-major axis of its orbit is just 0.017 astronomical units – around one-twentieth of the Mercury-Sun distance. In this image, the planet, which has a surface temperature exceeding 1500 Celsius, is depicted as highly volcanic, and is seen against the backdrop of its parent star. |