Kepler-11f is an exoplanet (extrasolar planet) discovered in the orbit of the Sun-like star Kepler-11 by NASA's Kepler space telescope, which searches for planets that transit (cross in front of) their host stars.

Kepler-11f is the fifth planet from its star, orbiting one quarter of the distance (.25 AU) of the Earth from the Sun every 47 days.

[4] Analysis of the planets and study results were published the next day in the journal Nature.

As these planets cross in front of their host stars with respect to Earth, a small and periodic dip in the star's brightness occurs; this dip is noted by the spacecraft and tagged for future study.

However, the star is approximately 1.74 times the age of the Sun, and is estimated to have existed for eight billion years.

[8] Kepler-11f's low density is not shared by the planets Kepler-11b and Kepler-11c because stellar irradiation has reduced their atmospheres to a thin layer.

[1] The planets accreted such atmospheres because they formed within the first few million years of the system's existence, when a protoplanetary disk was still present.