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The Origin of the 3° K Radiation

It is recalled that one of the most fundamental laws of physics leads to the prediction that all matter emits electromagnetic radiation. That radiation, called Planck radiation, covers an electromagnetic spectrum that is characterized by the absolute temperature of the emitting matter. From astronomical observations, we know that most matter in the universe is in the gaseous phase at 3° K. Stars, of course, are much hotter. The characteristic Planck spectrum, corresponding to 3° K, is actually observed in the universe exactly as required.