Kepler 186f earthlike concept

Kepler-186f is the first Earth-sized exoplanet discovered in the habitable zone of its star, located about 500 light-years from the Solar System.

About this subject

Discovered in 2014 by the Kepler space telescope, Kepler-186f orbits the red dwarf star Kepler-186 in the constellation Cygnus. With a radius about 1.1 times that of Earth, it is the outermost of five known planets in the system. Its 130-day orbit places it within the habitable zone, the region where temperatures could allow liquid water on the surface. However, since it is close to a cool, dim star, the planet is likely tidally locked, with one side always facing the star and the other in perpetual darkness. In such a scenario, twilight zones could harbor conditions favorable for life, provided there is a sufficient atmosphere to redistribute heat. The exact composition of the planet remains unknown, but models suggest it could be rocky and might contain oceans. Kepler-186f's discovery marked a milestone in the search for potentially habitable worlds beyond the Solar System, demonstrating that Earth-sized planets exist in the temperate zones of other stars.

Frequently Asked Questions

Is Kepler-186f truly habitable?

Habitability is uncertain. Although it lies in the habitable zone, its red dwarf star emits little light and the planet is likely tidally locked, which may hinder liquid water. The presence of an atmosphere is crucial, and we have no data on it yet.

How far is Kepler-186f from Earth?

Kepler-186f is about 500 light-years away in the constellation Cygnus. With current technology, a spacecraft would take thousands of years to reach it.

How was Kepler-186f discovered?

It was discovered by NASA's Kepler space telescope using the transit method. The telescope detected tiny dips in the brightness of the star Kepler-186 as the planet passed in front of it.