The mysterious phenomena that could unlock the secrets of the universe.

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".

'Clear and compact ... It's hard to fault as a brief, easily digestible introduction to some of the biggest questions in the Universe'