Kepler-70b is one of two postulated exoplanets orbiting the subdwarf B star (sdB) Kepler-70. The other planet is Kepler-70c, and both planets orbit very close to their host star. It is also the hottest known exoplanet as of mid-2017, with a surface temperature of several thousand Kelvin. Its density is 5500 kg/m3 which is not much different from Earth.While the precise temperature is not known, it is expected to be hotter than the surface of the Sun.