GENERAL KNOWLEDGE

Detailed explanation-1: -Measurements made by NASA’s WMAP spacecraft have shown that the universe is 13.7 billion years old, plus or minus about 130, 000 years.

Detailed explanation-2: -Scientists’ best estimate is that the universe is about 13.8 billion years old.

Detailed explanation-3: -The Big Bang was the moment 13.8 billion years ago when the universe began as a tiny, dense, fireball that exploded. Most astronomers use the Big Bang theory to explain how the universe began.