Right after the big bang, ALL matter was superheated to a plasma state at trillions of degrees. Bodies tend to stay in the same state they are, unless they are affected by an external force. If there was no “space” or other form of cold mass to transmit heat to, why did the superheated matter start to cool down?
I’m thinking it may be related to energy released when particles started to merge/combine with others to form atoms, molecules, etc., but I’m sure someone here has a better explanation.
In: Planetary Science
Heat is radiated away in the form of electromagnetic radiation, or light. This light also cools down (becomes lower in average frequency) as it is redshifted by the cosmological expansion.
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