The planet Mars is at an average distance from the Sun of 1.52 AU and its albedo is 0.25. a) Using the value given in the book for the luminosity of the Sun, calculate the power average solar radiation emitted by the planet. b) Assuming that the average thermal radiation energy emitted by the entire surface of the planet is equal to the solar energy consumed (i.e., the planet is in equilibrium thermal and does not have internal sources of energy), calculate the average temperature of the surface of Mars. c) Compare the result with the average measured temperature of 230 K. How can you explain the difference?