We know that the Universe is expanding and there are millions of celestial bodies flying away from each other. But how did we get here?

Of course, it's broadly accepted that the Universe and life itself started with the Big Bang, but what were the first few seconds of the Universe like?

In this episode of Futureproof Extra, we are taken back to the times immediately after the big bang, from being extremely hot - and nuclear - to what it is today.

Jonathan speaks to Dan Hooper, Head of the Theoretical Astrophysics Group at the Fermi National Accelerator Laboratory and author of ‘At the Edge of Time: Exploring the Mysteries of Our Universe’s First Seconds’.