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Today, the consensus among scientists, astronomers and cosmologists is that the Universe as we know it was created in a massive explosion that not only created the majority of matter, but the physical laws that govern our ever-expanding cosmos. This is known as The Big Bang Theory.
So, now you're an expert astronomer who can calculate something as interesting as the age of our universe. That age is estimated to be about 13.7 billion years! About 13.7 billion years ago, the Big Bang occurred. The Big Bang is an explanation of how the universe began from an infinitely compact state, and it thus marks the age of our universe.