Apply the results of Example 14.14 to estimate the temperature of the dwarf planet Pluto...

Apply the results of Example 14.14 to estimate the temperature of the dwarf planet Pluto. In your calculation, assume Pluto is at its mean distance from the Sun, Compare your answer with the measured temperature of Pluto, about 40 K. How do you think astronomers are able to measure the temperature of Pluto?

(reference example 14.14)