About this world
K2-129 b is an Earth-sized planet orbiting K2-129, a cool red dwarf 90.7 light-years from Earth. It is about 1 times the size of Earth. It completes an orbit every 8.24 days at 0.057 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 419 K (146 °C): far too hot for liquid water on its surface. By the "cosmic shoreline", its star has probably stripped its atmosphere away, leaving bare rock.
It was discovered in 2017 by transit with K2. A planet crosses its star and dims it by a tiny, periodic fraction.