Video Transcript
Approximately how long ago did the
Big Bang occur? Is it (A) 6,000 years ago, (B) one
million years ago, (C) 14 million years ago, (D) four billion years ago, or (E) 14
billion years ago.
We can answer this question by
recalling two facts. (1) The Big Bang occurred before
anything was formed that exists in the universe now. (2) The Earth formed about four
billion years ago. The Big Bang must then have
occurred more than four billion years ago.
Looking at the answer options, the
only option with a value greater than four billion years is option (E). We accept option (E). The Big Bang occurred approximately
14 billion years ago.
