coldest place in the solar system

The lowest temperature ever recorded at the surface of a body in the solar system is the surface temperature of Neptune's moon Triton, which Voyager 2 measured as -235 deg C - 38 degrees above absolute zero. Temperatures on Pluto are almost certainly very similar, though only ground-based estimates are available. They put the bright areas on Pluto at about -233 deg C, with its darker areas around 20 degrees warmer. Pluto and Triton seem to be very similar - more alike than any other pair of bodies in the solar system. The surface temperature of a moon or planet depends on several factors: its distance from the Sun, whether it has an internal source of heat, and the effects of any atmosphere. Triton and Pluto both receive very small amounts of heat from the Sun, have no internal heat, and are cooled further by the evaporation of ices from their surfaces.