Exoplanet Kepler-186f could be quite similar to Earth. Residing at 582 light years distant from Earth, the exoplanet orbits a red dwarf star that is about half the diameter of the Sun. The planet itself is about the same size of Earth and orbits its star in the habitable zone, with an orbital distance comparable to that of Mercury.

Image Credit: NASA Ames/SETI Institute/JPL-Caltech