Since he Universe is all there is, there's nothing for it to expand into. So what does "expansion" mean?

Some of the Universe's most important secrets are hidden in the shape of a beautiful undulating curve: the power spectrum of the cosmic microwave spectrum. This article explains how.

Find out all you need to know about the cosmic microwave background in this comprehensive overview.

To understand the why the cosmic microwave background tells us so much about the Universe, you first need to understand what created it: sound waves travelling through the early Universe.

The cosmic microwave background is the earliest light we can see in the Universe. So important is this baby picture of the Universe, it's been involved in two Nobel Prizes. Why?

In memory of Stephen Hawking we look at the equation he was most proud of.

How will the Universe end? In a big crunch? Or a big freeze? It all depends on its shape...

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Modern theories suggest that the Universe really is unimaginably large — perhaps it's infinite, but even if it's not, it's so large it may as well be. But does this sheer scale affect how we reason about cosmology? In this video interview, we talk to David Wallace to find out more.

Physicists have discovered evidence that our Universe might be a giant hologram.

When it comes to the entire cosmos, we humans are incredibly small and insignificant. But that's precisely why we need to take ourselves into account when thinking about the Universe. Find out why.