Since he Universe is all there is, there's nothing for it to expand into. So what does "expansion" mean?
What is dark energy and how do we know it's there?
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?
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.
Taking apart the CMB picture using the maths of sound.
Rock and its use for tools and buildings has shaped human civilisation. Here's an introduction to the maths of rocks.
Why your muesli shakes down in unexpected ways.