Tiny planet Kepler-37b found

Astronomers have made what they say are the first observations of a planet outside our solar system smaller than Mercury, the smallest planet orbiting our sun.  Identified by studying nearly three years of high-precision data from NASA’s Kepler spacecraft, the planet is estimated as being about the size of the Earth’s moon. It is one of three planets orbiting a star designated Kepler-37 in the Cygnus-Lyra region of the Milky Way.