In the New Year issue of BBC Science Focus Magazine, we cover the biggest ideas that you need to understand in 2021. Over the next few episodes of the Science Focus Podcast, we’ll be talking to the experts who will explain these ideas in their own words.

In this episode, we talk to science writer Marcus Chown, who tells us all about the major problems in our current understanding of cosmology. We discuss the Big Bang, dark matter, inflation, and what we still don't know about the formation of our Universe.

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