Antimatter

As an astronomer, I collect stars. There are several hundred billion of them in our Galaxy, the Milky Way, so it’s important to find a way to categorise them. While others might rank their stars by co

The tech revolution that manipulates the subatomic world

Amazing answers to your curious questions

Our understanding of the Universe has revealed that its existence, and indeed our own, relies on a particular set of rules. For example, the fundamental ‘constants of nature’, such as the charge of th

It’s difficult to know for sure how many electrons are in the Universe. British physicist Arthur Eddington (1882–1944) came up with a number in 1938, now known as the ‘Eddington number’. Eddington’s c

Measuring time using the Earth’s rotation was always an imprecise business, so now we do it using the ‘tick’ of an atom