Einstein and God

Einstein uses his concept of God more often than a Catholic priest. Once I asked him: 'Tomorrow is Sunday. Do you want me to come to you, so we can work?' 'Why not?' 'Because I thought perhaps you would like to rest on Sunday.' Einstein settled the question by saying with a loud laugh: 'God does not rest on Sunday either.'

 Gravity Travels at the Speed of Light

Here's the rub. In Newton's theory of gravity, one body exerts a gravitational pull on another with a strength determined solely by the mass of the objects involved and the magnitude of their separation. The strength has nothing to do with how long the objects have been in each other's presence. This means that if their mass or their separation should change, the objects will, according to Newton, immediately feel a change in their mutual gravitational attraction. For instance, Newton's theor...