how do we know the universe began 13.8 billion years ago

how do we know the universe began 13.8 billion years ago. There are some references to how do we know the universe began 13.8 billion years ago in this article. If you are looking for how do we know the universe began 13.8 billion years ago you've came to the right place. We have posts about how do we know the universe began 13.8 billion years ago. You can check it out below.

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