What is the temperature of the exosphere?

Question

What is the temperature of the exosphere?

Answer 1

"The exosphere is the outermost layer of the earth's atmosphere, starting at 500-1000 km above the surface. Unlike the ocean's surface, the "edge" of the atmosphere is fuzzy, gradually thinning to the vacuum of space. At these altitudes the air is so tenuous that temperature has to be defined in terms of the energy of individual molecules. With each molecule on its own, so to speak, daytime energies reach well over the equivalent of a thousand degrees as the Sun's rays energize the molecule. Then at night the molecule radiates its energy away and its energy level plunges to within a few degrees of absolute zero. "

Answer 2

The temperatures range from 300 degree celcius to 1700 degree celcius in the exosphere.