Question

how old is the universe according to the big bang theory?
16.2 billion years old
13.8 million years old
16.2 million years old
13.8 billion years old

Explanation:

The current scientific - consensus based on the Big Bang Theory and various astronomical observations, such as the cosmic microwave background radiation and the expansion of the universe, is that the universe is approximately 13.8 billion years old.

Answer:

D. 13.8 Billion years old