Part of the new Ladybird Expert series, 'Gravity' is an accessible introduction to a force as familiar to us as breathing. Written by physicist Jim Al-Khalili, 'Gravity' proves to be so much more than the adage: 'what goes up must come down'. Stuck to the surface of our planet we experience gravity merely as a force pulling us down to the ground, but we discover that it is far richer than that. Inside you'll learn that gravity is not really a 'force' at all, but something altogether more profound. In fact, gravity controls the very shape of space and the passage of time themselves and, as such, the history and destiny of the entire Universe.