Kepler 186f is an exoplanet orbiting the red dwarf star Kepler 186 in the constellation Cygnus.
It was discovered in 2014 by the Kepler space telescope and was considered a candidate for extraterrestrial life by Human astronomers in the 21st century.
Despite Humans thinking of it as an Earth-like world, that was not the case. A probe that was sent there in 2284 revealed that it is a lifeless desert world similar to Mars. Despite this, the Confederacy of Humanity has already established a few colonies there and has already terraformed it.