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A white dwarf is the cooling remnant of a star similar to our Sun. A particular white dwarf has a temperature of 16155 K and a radius of 7.5?106m. White dwarfs are excellent radiators with an emissivity very close to 1 (so close that you should assume it is 1.0). The white dwarf is situated in the vacuum of space with a temperature of 2.73K. What is the rate at which the white dwarf radiates energy into space?
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