10 Facts about Kepler-186f Planet : An Earth-Sized Planet in the Habitable Zone of a Cool Star"
At nearly 490 light-years (151 pc) distant:
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| Size comparison of Kepler-186 f with Earth |
- It is the first planet with a radius similar to Earth's to be discovered in the habitable zone of another star.
- It is closer to its star than Earth is to the Sun.
- Kepler-186f's axial tilt (obliquity) is likely very small, in which case it wouldn't have tilt-induced seasons as Earth and Mars do.
- The planet is about 11% larger in radius than Earth (between 4.5% smaller and 26.5% larger), giving a volume about 1.37 times that of Earth (between 0.87 and 2.03 times as large).
- Kepler-186f is too close to the star, and therefore too hot to have liquid water.
- Kepler-186f is in a higher orbit, where the star's tidal effects are much weaker, so there may not have been enough time for its spin to slow down that much.
- It will probably rotate much more slowly than Earth; its day could be weeks or months long.
- Kepler-186f orbits an M-dwarf star, while Kepler-62f orbits a Sun-like star.
- If such a planet exists, it cannot be much more massive than Earth as it would then cause orbital instabilities
- Kepler-186f receives about 32%, placing it within the conservative zone but near the outer edge, similar to the position of Mars in our Solar System.