Kepler 20e and 20f
These planets are two of the smallest Kepler has found yet, and two of the most Earth-like. Kepler-20e, at the top, orbits its star every 6.1 days. At just 4.7 million miles from its star, its surface temperature reaches a searing 1,400 degrees F.
Kepler-20f, at bottom, is 1.03 times the size of Earth, one of the closest to our own planet's size of any exoplanet yet discovered. It has somewhere less than three times Earth's mass. It's just 10.3 million miles from its star (we're 93 million from ours) and as such makes an orbit in just 19.6 days. Its surface temperature is about 800 degrees F, but astronomers believe it may have held on to a water-vapor atmosphere.