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.

Physicists believe that around 82% of all the matter in the Universe is invisible dark matter. But if it's invisible how do they know it's there?

What is dark energy and how do we know it's there?

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

Cambridge mathematicians and physicists remember their most famous colleague with fondness.

Cosmology has an ambitious goal: to understand the Universe in its entirety. Find out more here.

Taking apart the CMB picture using the maths of sound.

From communication technology to LCD displays: crystals are a hugely important part of modern life. Find out more about them with this article.