What is the Planck era?

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The Planck era refers to the earliest moments after the Big Bang, when the universe was extremely small and dense, and the laws of physics as we know them did not yet apply. During this era, a theory of everything (TOE) is needed to understand the universe, and quantum mechanics is necessary to describe both particles and spacetime. At this scale, spacetime itself can be described as a quantum mechanical "foam" rather than a smooth sheet. Therefore, all of the above options are correct.

What Is the Planck Era