NASA's Kepler spacecraft has discovered Kepler-10b, its first confirmed rocky planet and the smallest transiting exoplanet discovered to date. Kepler-10b is only 1.4 times the size of Earth and has an average density of 8.8 grams per cubic centimeter, similar to that of an iron dumbbell. The planet orbits its star in only 0.84 days and is not in the habitable zone, where liquid water could exist.
For more information about the Kepler mission, please visit www.nasa.gov/kepler
For more information about Kepler's recent discoveries, please watch Kepler: The Search for Earth-size Planets Begins at: http://www.youtube.com/watch?v=5Azfehl2tBU