According to Big Bang Theory, the Universe began about __________ billion years ago.
- A. 10 - 20
- B. 20 - 30
- C. 30 - 40
- D. 40 - 50
Explanation
Modern measurements place the Big Bang at about 13.8 billion years ago, which falls within the 10–20 billion-year range. The wider ranges begin far above the accepted estimate.