What is dark energy and how do we know it's there?
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.
Cosmology has an ambitious goal: to understand the Universe in its entirety. Find out more here.
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?
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.
Since he Universe is all there is, there's nothing for it to expand into. So what does "expansion" mean?