Can man go to the future or to the past using theory of relativity?
The theory basically proposes that even time is relative and not absolute. What does this mean? Previously ( before Einstein came into the picture ), the best physical model of the universe was Newtonian Physics ( The Physics invented by Sir Isaac Newton ).
Here, time is considered absolute (Newtonian) . One implication of this is that once time has passed it cannot be retraced.
Einstein came with remarkable theory that everything? is relative, and thus can be retraced. For example, if you can travel in the speed of light, you may be able to catch up with time as it emanates through space… its just a ”possibility”… nobody has proven it yet. One reason why this ”logic” may be substantiated is by how our powerful telescopes ( e.g, Hubble ) captures amazing pictures , say of some stars, a couple of million years ago. This light carrying the image of that star has reached us today after travelling millions of years through the void of space. So actually we are seeing TODAY an image of something that has occurred million years ago,!
Relativity theory generally speculates that everything is just measured relative to one another. Example , if you standing still and watch a car speed by in 40 miles/hour, the relative speed of the car is 40 miles per hour, ( relative to you ). If the same car with same speed was beside another car who is travelling in the same direction with speed 30 miles/hour, than from this car (2nd one ), the initial car is just moving at a relative speed of 40 – 30 = 10 miles per hour. That is, the relative speed of the initial car is 10 miles/hour with respect to the 2nd one.
Nobody has yet found a way to travel in time yet…
I don’t think it will happen.