Artist impression of Kepler 10b

Videonummer 11927441
Kepler-10b is the first confirmed rocky exoplanet, discovered using NASA's Kepler space telescope. As of January 2011, it is the smallest known transiting exoplanet, with a mass of 4.6 Earth masses and a radius of 1.4 Earth radii. Using data from Kepler, the W.M. Keck Observatory confirmed the existence of Kepler-10b using radial velocity measurements obtained with the HIRES instrument. Kepler-10b is the first definitively rocky exoplanet. Though CoRoT-7b was discovered before Kepler-10b and has been claimed to be rocky, there is more room for other interpretations in the case of CoRoT-7b's composition than there is for Kepler-10b. This is indicated in the plot to the left, which shows the range of masses and radii consistent with the observations of each planet and curves of compositions implied by those masses and radii. Although Kepler-10b is much too hot to harbor life as we know it, the discovery of Kepler-10b is an important step though towards finding planets that could harbor life. The high signal to noise of the Kepler-10b detection is a promising indication that the Kepler mission will be able to detect even smaller exoplanets, including detection of a rocky planet similar to our own.
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Credit: Science Photo Library / Berry, Dana / Kepler Mission / NASA
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