This unit is from our archive and is an adapted extract from How the universe works (S197) which is no longer taught by The Open University. If you want to study formally with us, yo]]> From the moment that Galileo dropped two cannonballs of different sizes and weights from the top of the Leaning Tower of Pisa mankind has been fascinated by the impact of gravity. This unit looks at gravity, its impact on objects and how the energy involved in the movement of objects is dispersed or stored.

This unit is from our archive and is an adapted extract from How the universe works (S197) which is no longer taught by The Open University. If you want to study formally with us, yo]]> The next stage of the story is to look at how and when the original mixture of all types of quark and lepton that were present when the Universe was 10⁻¹¹ s old, gave rise to the Universe today, which seems to be dominated by protons, neutrons and electrons.