discussion on gravity and how Newton was almost right. Good enough to get us to moon. But Einstein proved space time can be warped. Large objects such as earth affects the space around it. Gravity well where things fall in. So gravity affects time. If we were to dig into the earth time would be even faster as its closer to the centre.
another area he discussed was an image of galaxy that looked identical in every way. Just happens that a massive object in the line of sight bent the light around it rendering two objects. Gravitational lensing.
He later used GPS systems as an example of the time dilation. Where clocks had to be synchronised. However clocks in orbit tick much slower due to less gravity. So it was important to factor in a correction to ensure military targets and positions were accurate. Targets could be off by kilometers otherwise.
There are such as things as gravity waves created when a binary neutron system orbits each. Talked about an instrument to test for this. However nothing found to date yet but doesnt mean they dont exist.
if we think of space as a thick soup then life would be easier? They call this spacetime. Its difficult and bizarre at first but im getting used to it.
