Why can't current theories describe what happened during the Planck era?
A) We do not yet have a theory that links quantum mechanics and general relativity.
B) We do not know how hot or dense the universe was during that time.
C) We do not understand the properties of antimatter.
D) The Planck era was the time before the Big Bang, and we cannot describe what happened before that instant.

Question

Quizplus · Accepted Answer

The Planck era was a time of extremely high energy and small scales, where both quantum mechanics and general relativity are needed to explain the behavior of the universe. However, the two theories are incompatible with each other and cannot be combined into a single theory yet. This is known as the problem of quantum gravity.

Why Can't Current Theories Describe What Happened During the Planck