How did the universe begin?

Over 13 billion years ago the Big Bang gave birth to the universe creating space, time, energy and matter.

To understand the laws of our universe now, scientists must work out how particles behaved at its high-energy beginning. They imagine what the universe was like then, but base their ideas on how our world behaves today.

Now, to test their theories, they’ve built a machine to recreate the conditions of our universe just after the Big Bang began.