The NASA Planet Quest website has tons of information on the search for exoplanets, and the 4,994 exoplanets currently being studied. Be sure to check out the Exoplanet Travel Bureau and their travel posters for exoplanets! You can download high resolution versions of the posters at the website! Each poster has an informative blerb about the exoplanet as well:
Kepler-186f is the first Earth-size planet discovered in the potentially ‘habitable zone’ around another star, where liquid water could exist on the planet’s surface. Its star is much cooler and redder than our Sun. If plant life does exist on a planet like Kepler-186f, its photosynthesis could have been influenced by the star’s red-wavelength photons, making for a color palette that’s very different than the greens on Earth. This discovery was made by Kepler, NASA’s planet hunting telescope.
Super cool… super fun… super space science!! Tons more awesome science about exoplanets at the NASA Planet Quest webpage!