The first 10^-43 s of the age of the universe, during which all four fundamental forces are believed to have been united, is called the A) Planck era. B) inflationary era. C) event horizon. D) Hubble time.

Question

Quizplus · Accepted Answer

The Planck era refers to the earliest period in the history of the universe, immediately following the Big Bang, when the four fundamental forces (gravity, electromagnetism, strong nuclear force, and weak nuclear force) are thought to have been unified.

The First 10-43 S of the Age of the Universe

The First 10^-43 S of the Age of the Universe