With dark matter and dark energy making up ninety-five percent of reality, this addition to the "Hot Science" series looks at the new research into the functionality of invisible material in relation to stars and planets. Brian Clegg also wrote "Dice World" and "A Brief History Of Infinity".

Brian Clegg is a science writer whose many books include Dice World and A Brief History of Infinity, both of which were longlisted for the Royal Society Prize for Science Books. He has written for numerous publications including The Wall Street Journal, Nature, BBC Focus, The Times and The Observer.