The World According to Physics

by Jim Al-Khalili

Individual perspectives of space and time separately are relative, but combined spacetime is absolute.

the special theory merges space with time, Einstein’s general theory of relativity links spacetime with matter and energy,

We can say that the reason that a body ‘falls’ to Earth is because it always moves to where time runs the slowest

expansion only happens in the vast expanses in between the galaxies, because within the galaxies themselves the gravitational field that holds them together is strong enough to withstand the overall cosmic expansion.

we are all quite literally made of stardust, for indeed it is within stars that many of the atoms in our bodies were made.

Many physical properties, familiar to us as continuous, are, in fact, discrete (digital rather than analog) once you zoom down to the subatomic scale.

life on earth is only possible because it ‘feeds’ off the Sun’s low-entropy energy.