In units of yards, how far from the Big Bang is the Recombination period, when the gas becomes transparent to light
A)much, much less than a yard
B)about a yard
C)about 5 yards
D)about 10 yards

Question

Quizplus · Accepted Answer

The Recombination period occurred about 380,000 years after the Big Bang, when the universe cooled enough for hydrogen atoms to form, making the gas transparent to light. The distance between the Big Bang and Recombination at this time was much less than a yard, since the universe was still very small and dense.

In Units of Yards, How Far from the Big Bang