Tides are mysterious. Why are there two tides per day? What causes Spring and Neap tides? What are Earth tides? Tides on other bodies in the solar system can lead to moons disintegrating – this is where the rings of Saturn come from. Stars have tides and there are now the amazing, new tidal "Heartbeat Stars". Tides from some black holes would tear a person apart, so don't get too close! This richly illustrated lecture looks at tides from the Earth to colliding Galaxies