In Pictures: NASA - Kepler's most excellent space ...
NASA illustration compares the planets in the Kepler-37 system to the moon and planets in the solar system. NASA's Kepler mission has discovered a planetary system that is home to the smallest planet yet found around a star like our sun, approximately 210 light-years away in the constellation Lyra. A "year" on these planets is very short. Kepler-37b orbits its host star every 13 days at less than one-third the distance Mercury is to the sun. The other two planets, Kepler-37c and Kepler-37d, orbit their star every 21 and 40 days.
In Pictures: NASA - Kepler's most excellent space discoveries