The Big Bang

published 4 years ago by BBC Radio

What happened 13.8 billion years ago? The Big Bang. Perhaps. Gillian Anderson explains.

NPI did the universe begins. It's tempting to believe that it didn't. That there was always something rather than nothing. Cosmologists used to believe the so called steady state theory of the universe. But hardly any do now is increasingly the evidence is pointing against that. Most agree that must have been a Big Bang moments when the whole universe began as an almost unimaginably dense concentration of energy roughly 13.8000000000 years ago. As soon as it came into existence it began to expand and cool this process boom subatomic particles and then hydrogen and helium gas. Clouds of these simple atoms combine to create stars galaxies and everything else that makes up the universe. Scientists have detected microwave radiation from the earliest moments ...

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