Since he Universe is all there is, there's nothing for it to expand into. So what does "expansion" mean?
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.
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.
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?
Cambridge mathematicians and physicists remember their most famous colleague with fondness.
What is dark energy and how do we know it's there?