There are eight planets in our solar system. venus is the hottest planet, with an average temperature of 460°c. the average temperatures of some other planets are given in the table. venus 460°c earth 14°c mars -60°c neptune -214°c the net change in temperature from neptune to mars is °c. the net change in temperature from earth to neptune is °c. the net change in temperature from venus to earth is °c.