Imagine a diamond sphere radius of 1 cm traveling in space far from any heat sources. Embedded in the center of the sphere is a magic heater that can produce 0.3 W for an indefinite amount of time. If the emissivity of the surface is zero, what temperature does the sphere reach? Why? The answer is infinite temperature. I don't understand this. If emissivity is zero, doesn't that mean the body doesn't emit OR absorb any heat? I would think that the answer is that it would not reach any temperature... Can somebody explain to me why it would be infinite temperature? Is it because the time factor?