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When did the universe begin?

the universe

the universe

13.73 billion years ago
When did the universe, the entirety of space and time, all forms of matter, energy and momentum, and the physical laws and constants that govern them begin (commence or get going)?
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External web pages (using standard web search):

Big Bang: How Did the Universe Begin? by Yuki D. Takahashi Spring 2000 . Science has advanced to the point where we can infer something about the entire universe.
Several prominent astrophysicists around the world are interested in answering these questions. In one paper, “No-Boundary Measure of the Universe,” published in Physical ...
Approximately 13.7 billion years ago, the entirety of our universe was compressed into the confines of an atomic nucleus. Known as a singularity, this is the moment ...
How Did the Universe Begin? by Ralph Epperson. There are only three possible answers to this question. 1. It was created by something larger than itself since the first law of ...
The universe and how it began is explained in this article from HowStuffWorks. Learn about the origins of the universe.

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