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Petakelvins
Definition: A petakelvin (PK) is a unit of temperature equal to 10¹⁵ kelvins, used in extreme astrophysical conditions and high-energy physics.
History: Temperatures reaching **petakelvin levels** are theorized to exist in **quark-gluon plasmas, the cores of hypermassive stars, and moments after the Big Bang**. While not used in everyday science, petakelvins help describe the most extreme thermal environments in the universe.