Kepler-705 b

Kepler-705 b is a super-Earth roughly twice Earth's radius and five times its mass, orbiting a cool, dim M-dwarf star roughly 900 light-years away. Its equilibrium temperature sits at a chilly 265 Kelvin—well below Earth's 288 Kelvin—suggesting a frozen world, though the planet's density of 2.98 grams per cubic centimetre indicates a rocky composition with potential interior heat sources. The planet orbits extremely close to its host star, completing a lap every 56 days at just 0.232 astronomical units, which raises questions about tidal heating and whether the planet might be tidally locked. The habitability score of 84 is notably high, likely reflecting the planet's rocky nature and the possibility of liquid water beneath an icy surface, or subsurface geothermal activity. However, this frigid equilibrium temperature and proximity to a faint star mean that any life here would depend on internal energy rather than stellar warmth—a scenario more analogous to Jupiter's moons than to Earth's sun-lit biosphere. Kepler-705 b's high habitability ranking despite its extreme conditions makes it an intriguing target for future biosignature studies if technology permits detection at such distance.