WHAT IS TIME
“The two main concepts of time are presentism and the block universe view of time. In presentism view of time only present is real while past and future do not exist and passage of time is just an illusion. Presentism may appear more intuitive however the block universe view is more popular among physicists and is supported by heavy weights in physics like Einstein. In block universe view time is laid out as a time-scape. This is based on theory of special relativity and an interpretation of Lorentz transformation equations called the Putnam argument. Physicist Roger Penrose advanced another variation of this argument called the Andromeda paradox. These paradoxes and anomalies arise from lack of simultaneity due to Einstein postulate of constancy of the speed of light in theory of special relativity. There is no free will in the block universe of time. All times in past and future already exist. There is however no explanation of lack of visitors from a futuristic technologically advanced civilization. Block universe also cannot explain what causes us to move through time towards the future and why we cannot willfully move back and forth through this time-scape. Neither of the two views on time can explain what time really is and what the cause of time is.” -from: timephysics.com