Kepler-62b

Kepler-62b is the innermost and the second smallest discovered exoplanet orbiting the star Kepler-62, with a diameter roughly 30% larger than Earth. It was found using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured. Its stellar fluxis 70 ± 9 times Earth's.

Kepler-62 b is a tidally locked planet with eternal light on one side and eternal darkness on the other. Because of its distance from Kepler-62, the day side is likely boiling with oceans of hot lava, any atmosphere thin and constantly being blown away by the heat. This exoplanet could probably not be terraformed without a change in its orbit and period of rotation. After this is done, the surface hardens into dry, solid rock, and a prominent atmosphere of buffer gases and CO2 are added from external sources. Next, water-rich comets can be redirected to bombard the surface, filling the low elevations with liquid water. Earthly plant life can then be introduced to build up the oxygen part of its atmosphere, finishing the terraforming process. It may lack a magnetic field, though increasing its rotation speed might solve this problem early on; if not, an artificial one could be built.