Question

what is causality? space time

Answer 1

Casuality is the cause of any effect that has been done or undertaken .. It is denoted by the symbol 'c'. Most of the time it is regarded as the velocity of the light but c is the velocity of causality .. Light's velocity varies with medium but casuality is kept constant that is the speed of any thing the expanding universe (observable) the space and time .. It is the velocity of light in the vaccum