The Temperature of a planet is determined by a balance between the energy received from the Sun and the energy radiated back out to space. The Earth's effective temperature, the temperature the Earth should have without an atmosphere, can be calculated knowing the solar input and the planet's Aledo.

a. Calculate the Earth's effective temperature (Te) in Kelvins and C based on the following:

Energy in = Energy out

(4 R2 earth ) ( Te 4 ) = R2earth S(1-A)

S = 1366 W/m2

= 5.67 x 10-8 W/m2/K-4

Albedo (A) = 0.3

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