The Thermal Behavior of Objects in Space
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چکیده
It is a common misperception that—because space is cold—an object initially at room temperature will cool in space. However, this is true only at night (that is, when the object is in the Earth’s shadow). Only then will the equilibrium temperature of any object in space be well below room temperature. During the daytime, the equilibrium temperature can be either above or below room temperature. One of the physical observables that the NMD system will use to try to discriminate the warhead from other objects in space is temperature. This appendix provides background information on the thermal behavior of objects in space and their equilibrium temperatures. It is convenient to discuss the thermal behavior of objects in space by first considering a theoretical object that absorbs all radiation incident upon it. Such an object, known as a “blackbody,” is also a perfect emitter of radiation.
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