The Planck temperature is a fundamental limit on temperature according to our understanding of quantum theory and general relativity. The magnitude of this temperature happens to be 1.4 * 10^32 K and was the temperature of the universe roughly 5.4 * 10^-44 seconds after the Big Bang.
Note that, this limit is not owing to merely relativistic velocity limits on the molecules. The kinetic energy of matter increases with temperature, and this does not necessarily have to always go into 'velocities'. The masses too increase.
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