Kepler-10b is the first confirmed terrestrial planet to have been discovered outside the Solar System by the Kepler Space Telescope. Kepler-10b does not lie in the habitable zone, the region in which liquid water could exist on a planet's surface. Therefore, it is unlikely any life exists on its surface. The planet is also tidally locked to its parent star, meaning only one side ever faces the star. Kepler-10b has a mass of 3.72±0.42 Earth masses and a radius of 1.47 Earth radii. However, it lies extremely close to its star, Kepler-10, and as a result is too hot to support life as we know it. Its existence was confirmed using measurements from the W.M. Keck Observatory in Hawaii. It was the first we identified as potentially harboring a very small transiting planet. The transits of the planet were first seen in July of 2009. The diameter of Kepler-10b is only about 1.4 times the diameter of Earth and it's mass is about 4.5 times that of Earth. It is the best example of a rocky planet to date. Kepler-10b as a scorched world, orbiting at a distance that's more than 20 times closer to its star than Mercury is to our own Sun. The daytime temperature's expected to be more than 2,500 degrees Fahrenheit, hotter than lava flows here on Earth. Kepler-10b as a scorched world, orbiting at a distance that's more than 20 times closer to its star than Mercury is to our own Sun. The daytime temperature's expected to be more than 2,500 degrees Fahrenheit, hotter than lava flows here on Earth. It has similar composition to Earth, but is more massive. Notice that the planets with the largest radii all fall in the category of "hot Jupiters," which means Jupiter-like planets that are hot because they orbit close to their stars. Kepler-10b has a density 4.6 times that of Earth, or similar to an iron dumbbell. This planet orbits its star, Kepler-10, once every 0.84 days (20 hours) and is 20 times closer to its star than Mercury is to our Sun. Kepler 10 distance from Earth is 564.27 light years. Intense radiation from the star has kept the planet from holding onto an atmosphere. Flecks of silicates and iron may be boiled off a molten surface and swept away by the stellar radiation, much like a comet's tail when its orbit brings it close to the Sun.

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