The Big Bang is thought to have happened about 13.8 billion years ago.

Quick Scoop

Most cosmologists agree that the universe is roughly 13.8 billion years old, which means the Big Bang occurred about 13.8 billion years in the past.

This estimate comes from precise measurements of the cosmic microwave background (the “afterglow” of the Big Bang) and how fast the universe is expanding today.

A few researchers have proposed alternative models where the universe could be much older, even around 26–27 billion years, but these are speculative and not the mainstream view.

In current standard cosmology, if you ask “how long ago was the Big Bang?”, the accepted answer is: about 13.8 billion years ago.

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