According to the Big Bang theory, atoms would have likely begun to form after approximately
A) 10 billion years.
B) 400,000 years.
C) 1 year.
D) 3 seconds.
E) 0.5 second.

Question

Quizplus · Accepted Answer

According to the current understanding of the Big Bang theory, atoms began to form approximately 400,000 years after the Big Bang, during a period called recombination. Prior to this, the universe was too hot and dense for atoms to form, as free electrons and protons were constantly colliding and ionizing each other.

According to the Big Bang Theory, Atoms Would Have Likely